What are I/O classes in C#? Define some of the most commonly used ones

The System.IO namespace in C# consists of several classes used for performing various file operations, such as creation, deletion, closing, and opening. Some of the most frequently used I/O classes in C# are:

File – Manipulates a file
Path – Performs operations related to some path information
StreamReader – Reads characters from a stream
StreamWriter – Writes characters to a stream
StringReader – Reads a string buffer
StringWriter – Writes a string buffer