What is the function of the 'go mod tidy' command in managing dependencies in a Go project?

The go mod tidy command in Go is used for managing project dependencies. It performs the following tasks:

• Removes unused dependencies from the go.mod and go.sum files.
• Adds all necessary dependencies used in the code but missing from the modules to go.mod and go.sum.

Thus, go mod tidy helps keep the dependency files up-to-date and clean, making project build and distribution easier.