Reference

The Practical AI Glossary

Plain-English definitions of the AI terms you keep hearing, what they mean, and when they matter inside a service business.

AI agent

Software that uses AI to complete a goal through several steps. It can decide what to do next, use tools, check the result, and adjust its approach.

Why it matters

An agent can handle work that is too flexible for a fixed automation. That freedom also makes it harder to predict and test.

In practice

An agent reviews a new client request, checks the account in your CRM, drafts a response, and creates the next task.

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Agentic AI

A broad name for AI systems that can make decisions and take actions while working toward a goal.

Why it matters

Agentic describes how a system behaves. An AI agent is a system built to behave that way.

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AI-native

A business is AI-native when AI is part of how its work is designed and delivered from the beginning.

Why it matters

A firm becomes AI-native when it rebuilds roles, processes, quality control, and client delivery around what AI makes possible. Buying an AI tool alone does not do this.

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AI workflow

A defined series of steps that includes one or more AI tasks.

Why it matters

A workflow follows a path designed in advance. It is usually easier to control than an agent that chooses its own path.

In practice

A workflow takes a sales call transcript, extracts the client’s needs, drafts a proposal, sends it for approval, and saves the approved version.

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Automation

Software that performs a repeatable task according to set rules.

Why it matters

Traditional automation works well when the steps and inputs are predictable. AI extends automation to work that involves language, judgment, or messy information.

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Copilot

An AI assistant that helps a person perform work but leaves that person in control.

Why it matters

A copilot may draft, summarize, or suggest. It normally waits for a person to review its work or choose the next step.

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Large language model (LLM)

The type of AI behind tools such as ChatGPT, Claude, and Gemini. It learns patterns from large amounts of information and uses them to produce a response.

Why it matters

An LLM can work with language, but it does not know facts in the same way a person does. Its answers still need the right context and checks.

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Model

The underlying AI system that processes a request and produces a result.

Why it matters

Models vary in quality, speed, cost, and the work they can handle. The most capable model is not always the best business choice.

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Prompt

The instructions and information given to an AI model.

Why it matters

Clear instructions help, but a clever prompt cannot repair a poorly designed process or missing business information.

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Context

The information available to an AI while it handles a request.

Why it matters

Context can include instructions, earlier messages, client details, policies, examples, and documents. The right context usually matters more than more context.

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Context window

The amount of information a model can consider during one interaction.

Why it matters

A larger context window allows longer documents and conversations. It does not guarantee that the model will use every detail correctly.

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Context engineering

The work of deciding what instructions, data, examples, tools, and history an AI needs to complete a task well.

Why it matters

Good context engineering gives the AI the same operating information a capable employee would need.

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Tool

A function an AI agent can use to retrieve information or take an action.

Why it matters

Tools can search, read a database, update a CRM, or send a message. Giving AI a tool is similar to giving an employee access to a business system, so permissions matter.

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Skill

A reusable set of instructions that teaches an AI how to perform a particular kind of work.

Why it matters

A tool gives AI an ability. A skill explains how your business expects that ability to be used.

In practice

A proposal-writing skill can define what information to collect, which template to use, and how the final proposal should be checked.

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Model Context Protocol (MCP)

A shared standard that helps AI applications connect to tools and information sources.

Why it matters

Think of MCP as a common type of connector. It can reduce the custom work needed to connect AI to documents, software, and company data.

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Retrieval-augmented generation (RAG)

A method that finds relevant information and gives it to an AI before the AI answers.

Why it matters

RAG can make answers more relevant and easier to verify. It does not guarantee that every answer will be accurate.

In practice

Before answering a staff question, the system searches your current operating procedures and supplies the relevant sections to the model.

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Grounding

Connecting an AI response to specific, trusted information.

Why it matters

A grounded answer can use your contracts, policies, service records, or approved research instead of relying only on patterns learned during training.

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Hallucination

An answer that sounds believable but contains invented or unsupported information.

Why it matters

Hallucinations are a normal risk with generative AI. Important outputs need trusted sources, clear limits, and checking.

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Memory

Information an AI system keeps and can use in later interactions.

Why it matters

Useful memory needs rules about what should be saved, updated, protected, and forgotten.

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Multimodal AI

AI that can work with more than one kind of information, such as text, images, audio, and video.

Why it matters

This allows one system to work across the different formats already used in client delivery.

In practice

A multimodal system reads an inspection report, examines site photos, and uses both to draft a recommendation.

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Reasoning model

A model designed to spend more effort working through difficult problems before answering.

Why it matters

Reasoning models can help with planning and multi-step decisions. They are often slower and more expensive, so use them where better judgment has real value.

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Token

A small unit of text or other information that an AI model processes.

Why it matters

AI providers often use tokens to measure usage and cost. Longer instructions, documents, and answers usually consume more tokens.

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Fine-tuning

Additional training that adapts a model to a particular kind of task or output.

Why it matters

Fine-tuning can help when a firm has many strong examples and needs consistent behavior at scale. Better instructions, context, or retrieval are often enough.

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Eval

A repeatable test used to measure how well an AI system performs a task.

Why it matters

Evals turn “this seems to work” into something a firm can measure before clients or staff depend on it.

In practice

An eval checks whether every proposal uses the approved price and avoids unsupported claims.

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Guardrail

A rule or control that limits what an AI system can do.

Why it matters

Guardrails can block sensitive data, limit access, or require approval before the system takes an important action.

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Human in the loop

A process in which a person reviews, approves, corrects, or takes over part of the AI’s work.

Why it matters

Human review belongs where a mistake carries meaningful cost. It does not need to slow down every small action.

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Orchestration

The coordination of models, agents, tools, people, and workflows.

Why it matters

Orchestration decides what runs, in what order, and what happens when something fails or needs approval.

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Computer use

AI that operates software through the screen, keyboard, and mouse much like a person would.

Why it matters

Computer use can help with older systems that lack useful connections. It is usually less predictable than using an API.

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API

A structured way for one piece of software to communicate with another.

Why it matters

An API can let an AI system read a CRM record, create an invoice, or update a project. It is usually more reliable than clicking through a screen.

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