Functionality refers to the range of operations that can be performed by a system or application. It encompasses the features and capabilities that allow users to achieve specific tasks, making it a critical aspect of software design and user experience. For instance, the functionality of a word processor includes text editing, formatting, and spell-checking, which collectively enhance productivity. In addition to software, functionality can also apply to physical products, where it describes how well a product performs its intended purpose. For example, the functionality of a smartphone includes calling, texting, and internet browsing, all of which contribute to its usability and appeal to consumers.