A domain is a distinct area of knowledge or activity, often used in various fields such as science, education, and technology. In the context of the internet, a domain refers to a specific address that identifies a website, like example.com. Each domain is unique and helps users easily find and access online content. In mathematics, a domain can refer to the set of all possible input values for a function. For instance, in the function f(x) = x^2, the domain includes all real numbers. Understanding domains is essential for navigating both the digital world and mathematical concepts effectively.