How can you read the entire contents of a file into memory in Go?

To read the entire contents of a file into memory in Go, you can use the ioutil.ReadAll() function. This function reads from an io.Reader, such as a file, and returns the content as a byte slice. It's a common approach for reading small to moderately-sized files into memory. For larger files, consider using a bufio.Scanner to read the file line by line to minimize memory usage.