Linear Block Codes are a type of error-correcting code used in digital communication to ensure data integrity. They work by taking a fixed-size block of data and adding extra bits, known as parity bits, to create a codeword. This codeword can then be transmitted over a noisy channel, allowing the receiver to detect and correct errors that may occur during transmission. These codes are called "linear" because the combination of codewords through addition (modulo 2) results in another valid codeword. This property simplifies the encoding and decoding processes, making Linear Block Codes efficient for applications in computer networks and data storage systems.