Git: Git is a distributed version control system designed to help developers manage and track changes in their code projects. It was created by Linus Torvalds, the same person who created Linux. Git allows developers to work on code individually or collaboratively with others.

Key points about Git:

1. Version Control: Git helps track changes to code over time, allowing developers to see what changes were made, when they were made, and who made them. This helps in collaboration and troubleshooting.
2. Distributed: Each developer has a complete copy of the entire project history and code on their local machine. This means they can work offline and later sync their changes with others.
3. Branching and Merging: Git allows developers to create separate branches to work on specific features or fixes. These branches can later be merged back into the main codebase.
4. Speed and Efficiency: Git is designed to be fast and efficient, making it easy to work with even large codebases.

GitHub: GitHub is a web-based platform that provides hosting services for Git repositories. It takes the capabilities of Git and adds collaboration and social features to make it easier for developers to work together and share their projects.

Key points about GitHub:

1. Web Hosting: GitHub allows developers to store their Git repositories on remote servers so that they can access and collaborate on their projects from anywhere with an internet connection.
2. Collaboration: GitHub provides tools for collaboration, such as pull requests, code reviews, and issue tracking, making it easier for teams to work together.
3. Social Network: GitHub has a social aspect, allowing developers to follow each other, “star” interesting projects, and contribute to open-source projects.
4. Public and Private Repositories: GitHub offers both public repositories (visible to everyone) and private repositories (only accessible to selected collaborators), giving developers flexibility in how they share their code.

Comparison:

1. Functionality: Git is a version control system that helps developers manage code changes locally. GitHub is a web-based platform that adds collaboration and social features to Git, making it easy for developers to work together online.
2. Hosting: Git is a system installed on a developer’s local machine, whereas GitHub provides a remote server to host Git repositories.
3. Accessibility: Git is accessible even without an internet connection since it works locally. GitHub requires an internet connection to access the remote repositories and collaboration features.
4. Collaboration: While Git allows multiple developers to work on a project, GitHub enhances collaboration by providing tools like pull requests, code review, and issue tracking, making it easier for teams to work together.

In summary, Git is the core version control system that helps manage code changes, and GitHub is a web-based platform that builds on Git, providing hosting, collaboration, and social features to make it easier for developers to work together and share their projects with the world.