String operations refer to the various methods and functions used to manipulate sequences of characters, known as strings. Common operations include concatenation, which combines two or more strings, and slicing, which extracts a portion of a string. Other operations include searching for specific characters or substrings, replacing parts of a string, and measuring the length of a string. In programming languages like Python and Java, string operations are essential for handling text data. These operations allow developers to format output, validate user input, and process data efficiently. Understanding string operations is crucial for effective coding and data manipulation.