# What Claude Code is and what it's for

> Everything you need to know about Claude Code: what it is, what it's for and how it can help developers and AI beginners.

- Source: https://doutorai.pt/en/blog/what-claude-code-is-and-what-its-for
- Author: Miguel Diamond (https://doutorai.pt/en/author/miguel)
- Category: Claude Code
- Published: Jun 29, 2026
- Site: Doutor AI (https://doutorai.pt/en) - AI tools for small businesses

## Quick answer
Claude Code is a coding tool created by Anthropic that works directly in your computer's terminal. Instead of writing code by hand, the developer describes what they want in natural language and Claude Code handles the rest. It's useful for developers, but also for anyone who wants to automate simple tasks with help from artificial intelligence.

- CLI tool from Anthropic that works inside the terminal and your files
- Edits code, runs commands and runs tests, all in natural language
- Supports agents, skills and MCP integration with external tools
- Requires a Claude Pro/Max subscription or API credits to work

## What Claude Code really is

Claude Code is a coding assistant created by Anthropic, the same company behind Claude. Unlike a regular chatbot that lives in a browser window, Claude Code works directly in your computer's terminal, inside your own files and projects.

The big difference compared to other AI assistants is that Claude Code doesn't just answer questions. It can read your code, edit files, run commands in the operating system and run automated tests, all in a single session. You make a request in natural language, for example "add a contact form to this page" or "find the error in this file", and Claude Code interprets the request, performs the necessary actions and shows what it did, step by step, with full transparency about every change it makes.

This is what Anthropic calls a CLI, or Command Line Interface, a tool that lives in the terminal instead of in a graphical application. That gives it far more direct access to your project than any browser chatbot will ever have. Claude Code can work on projects with dozens of files at the same time, navigate between folders and keep the context of all the work during a long session.

## What Claude Code is for

There are many situations where Claude Code becomes useful. For developers, the most common cases are:

- Create a new project from scratch, including the folder and file structure

- Fix code errors (debugging) without having to analyze everything manually line by line

- Refactor old code to make it cleaner, more readable and more efficient

- Write automated tests for a project that doesn't have any yet

- Understand a file or inherited project you don't know well

- Migrate code between programming languages or frameworks

But Claude Code isn't exclusive to professional developers. For less technical users, it can be used to automate repetitive tasks in a folder of files, create a simple script that organizes data from a CSV, generate reports from sources of information or even put together a simple static site from text instructions. With the right instructions, a motivated beginner can get practical results surprisingly fast.

The key is knowing how to communicate well with the tool. The clearer and more specific the instruction you give, the more useful and accurate the result will be. It's no different from working with a human colleague: the better you explain what you want, the better they deliver.

## Concepts you'll come across

As you explore Claude Code, you'll run into some technical terms. Here are the most common ones and what they mean in practice:

ConceptWhat it means

Agents (sub-agents)Autonomous tasks that Claude Code launches in parallel to work faster on complex projects
SkillsSpecialized instructions that teach Claude Code to work in a specific way or to follow certain rules of your project
Commands (slash commands)Shortcuts like /clear, /help or /compact to control the session directly in the terminal without leaving your workflow
MCP (Model Context Protocol)An open protocol that lets Claude Code connect to external tools, like databases, APIs or remote file systems

You don't need to master all of these concepts to get started. Most users start with just basic commands in natural language and learn the rest as their needs grow.

## Claude Code vs other AI assistants

Many people ask how Claude Code compares to ChatGPT or GitHub Copilot. They are tools with very different goals, and understanding those differences helps you pick the right one for each situation:

FeatureClaude CodeChatGPTGitHub Copilot

Access to the local file systemYes, fullNoPartial (via IDE)
Runs commands in the terminalYesNoNo
Integration with external tools (MCP)YesLimitedNo
Works on multiple files at the same timeYesNoPartial
Ideal forComplete projects in the terminalQuestions, texts, analysisCode autocomplete in the editor

In short: Claude Code is the right choice when you want AI to work actively inside your project, not just give you suggestions to copy and paste. If you need someone who writes, reviews and executes, Claude Code is the most capable of the three in that role.

## Where to start

If you want to try Claude Code, the logical next step is to install it on your computer. We have a complete guide with all the details: [How to install Claude Code step by step](https://doutorai.pt/en/blog/how-to-install-claude-code). Installation takes less than five minutes and works on Windows, Mac and Linux.

To understand what it will cost, also read the article [How much Claude Code costs](https://doutorai.pt/en/blog/how-much-does-claude-code-cost), where we explain the two payment options in a clear way, with no surprises.

You can visit the [Claude Code page on Doutor AI](https://doutorai.pt/en/claude-code) to get access to resources, practical examples and news about the tool.

## Frequently asked questions

### Is Claude Code the same as Claude?

No. Claude is Anthropic's AI assistant, available in the browser at claude.ai. Claude Code is a tool specifically for coding that uses Claude as its engine, but it works in your computer's terminal, with direct access to your files and projects.

### Do I need to know how to code to use Claude Code?

It's not required, but it helps. Claude Code was designed mainly for developers, but users without technical experience can use it for simple tasks with a bit of initial guidance.

### Does Claude Code work on Windows, Mac and Linux?

Yes. Claude Code is available on all three operating systems. Installation is done via npm, which works on any modern platform.

### What is MCP in Claude Code?

MCP stands for Model Context Protocol. It's a protocol that lets Claude Code connect to external tools like databases, APIs or web services, greatly expanding what it can do within a project.

### Does Claude Code have internet access by default?

No. By default, Claude Code works with your local system. Through MCP you can set up integrations with external services, but that requires additional configuration.


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Content by Doutor AI (https://doutorai.pt/en). When quoting, please cite the source: https://doutorai.pt/en/blog/what-claude-code-is-and-what-its-for