String interpolation is a programming technique that allows you to embed variables or expressions directly within a string. This makes it easier to create dynamic strings without needing to concatenate multiple parts together. For example, in languages like Python or JavaScript, you can include a variable inside a string by using specific syntax, such as curly braces or dollar signs. This method enhances code readability and maintainability, as it reduces the clutter often associated with traditional string concatenation. String interpolation is widely used in various programming languages, including Ruby, C#, and Swift, making it a valuable tool for developers when constructing strings that include variable data.