Go packages group related source files under a single name to organize code and enable sharing across modules.
Go packages are logical groupings of source files that share a single package name, enabling code organization and reuse across modules. You define a package by placing .go files in the same directory and declaring the same package name at the top of each file. To use a package from another module, import it using its full module path in your source code.
package main
import "fmt"
func main() {
fmt.Println("Hello, World")
}
A Go package is like a folder in a filing cabinet that holds related documents (code files) together so they can be found and used easily. It matters because it prevents naming conflicts and lets you share code between different projects without copying files. You use packages whenever you want to organize your code or use someone else's library.