String comparison is the process of evaluating two or more sequences of characters to determine their relationship. This can involve checking if the strings are identical, if one string is greater than another, or if they are different. String comparison is commonly used in programming and data processing to sort, search, or validate text data. In many programming languages, such as Python and Java, string comparison is performed using built-in functions or operators. These comparisons can be case-sensitive or case-insensitive, depending on the requirements. Understanding string comparison is essential for tasks like user input validation and data organization.