The correct option is GitHub Copilot Chat because it lets you ask for an explanation of a complex function and get context about the surrounding code without leaving Visual Studio Code.

This feature gives you a chat panel and inline chat inside the editor so you can ask questions about selected code, request explanations, and get summaries while it uses your workspace to ground its answers. You can stay in the editor and have it reason over open files and project symbols to provide relevant context.

The option GitHub Copilot Inline Suggestions focuses on code completions as you type and it does not offer an interactive conversation that explains code or pulls in broader project context.

The option GitHub Copilot CLI is designed for the terminal and helps with shell commands and Git tasks and it is not the in editor chat experience for discussing your code.

The option GitHub Copilot Multiple Suggestions shows alternative completion candidates and it is still a suggestion workflow rather than a chat that explains complex functions with workspace context.

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