What is Claude?

You had an idea yesterday. Just a glimmer, written in a notebook or scribbled into a Slack draft you never sent. This morning it is staring back at you — hungry for answers, connections, and the tedious work of turning it into something real. A deck. A spreadsheet. A plan you can actually send. Instead of staring at the blank page, you open Claude and start talking through it, the way you would with a sharp colleague who has the time to help.

That is the promise of this course. Claude is not a search box and not a chatbot. Claude is an AI assistant built to act as your thinking partner — a collaborator who can read what you have, help you think through what you need, and move with you from idea to finished work.

Built to be helpful, harmless, and honest

Claude is made by Anthropic, an AI company whose whole premise is that AI assistants should behave well by design — not by accident. The approach they use is called Constitutional AI: Claude is trained against an explicit set of principles so that, at a high level, it tries to be helpful, harmless, and honest.

In practice that means three things you will feel as you use Claude:

• It avoids toxic, discriminatory, or illegal output even when you push.
• It tries to be straight with you — it will say when it is uncertain, when it needs more context, or when your question does not have a single right answer.
• It takes direction. You can tell it the tone, the format, and the role it should play, and it will adjust.

This last point is what separates Claude from a generic chatbot. The term Anthropic uses is steerability — the ability to shape Claude's behaviour without fighting the tool. You get your result with less effort, not more.

More than a chatbot

Most people's first AI experience is a single question answered in a single paragraph. Claude will do that. But that is not where the value is.

Think of Claude as a thought partner for the work you actually get paid to do:

• Writing and content creation. Social posts, professional emails, reports, long-form pieces. Claude takes direction on personality and tone, so you can iterate together on structure and voice until it sounds like you, not like a template.
• Research and analysis. Upload documents and Claude will help you make sense of them. Claude's context window — the amount of text it can consider in a single conversation — is 200,000 tokens, roughly 500 pages, with up to 1 million tokens on Pro, Max, Team, and Enterprise plans. That means you can feed it real source material, not just a summary, and ask it questions that depend on the whole set.
• Coding assistance. Even if you do not write code for a living, Claude can help you read code, debug a broken formula, or generate a small script for a one-off task. Developers get a lot more, but there is useful ground for everyone.
• Problem-solving and reasoning. Mathematical problems, strategic thinking, complex analysis. Claude's Opus and Sonnet models offer two modes: near-instant responses for quick questions, and extended thinking that works through problems step by step when you need more careful reasoning.
• Learning new things. Claude can adapt to your pace, ask you questions instead of dumping an answer, and walk you through unfamiliar territory. A dedicated Learning mode guides your reasoning rather than replacing it.

The common thread is that you bring the context and the expertise. Claude brings intelligence, stamina, and a willingness to draft, revise, and draft again.

Three ways to reach Claude

Claude the intelligence is one thing. Claude the interfaces are several, because different work needs different surfaces. All of them are included on every plan — Free, Pro, Max, Team, and Enterprise — and your conversations, projects, and memory sync across devices when you are signed in.

• Claude.ai (web, desktop, mobile). The main way most people use Claude. Ask questions, brainstorm, co-write documents, upload files, generate artifacts. This is the focus of this course and the surface you should start with.
• Claude Code. An agentic coding tool aimed at developers. It can directly edit files, run commands, and create commits. Useful for technical work but not required for this course.
• Claude and Slack. Claude inside your team's chat, searching your workspace for context when you ask a question.
• Claude for Excel. A sidebar in Microsoft Excel where Claude can read, analyse, modify, and build workbooks with you — formulas explained, assumptions updated, errors debugged.

When to use which: If you are not sure, start in Claude.ai. It is the most general surface and covers the majority of the tasks you will hand to Claude. The other surfaces are there when your work already lives in Excel, Slack, or your codebase.

Why this matters for you

The point of this course is not to make you a Claude power user for its own sake. It is to turn Claude into a reliable partner for the work you are already doing. That starts with a mental shift: treat Claude less like a tool you operate and more like a colleague you brief.

The rest of Module 1 is about making that shift concrete — how to start your first conversation, how to get better results when the first try falls flat, and how to pick the right Claude surface when you move from quick questions to larger tasks.