This document discusses Longest Common Subsequence (LCS) and provides an example. It begins with an introduction that defines LCS as the longest sequence of characters common between two or more strings. It then discusses applications of LCS in bioinformatics, plagiarism detection, and version control systems. An example is provided comparing the strings 'ABCD' and 'ACDF' where the LCS is 'ACD'. The document concludes with a step-by-step simulation of finding the LCS between the strings 'R,G,B,G,A,R' and 'B,G,R,A,R', which is 'BGAR'.