The "strings" package in Go-Lang provides various functions to manipulate strings. For example, strings.Contains(s, substr) returns true if the string s contains the substring substr. strings.Replace(s, old, new, n) returns a copy of the string s with the first n occurrences of old replaced by new. strings.Split(s, sep) returns a slice of strings that are separated by sep in the string s. To use the "strings" package, you need to import it at the beginning of your Go file: import "strings"