Satisfiability refers to the ability of a logical formula to be true under some interpretation of its variables. In simpler terms, it asks whether there is a way to assign values to the variables in a formula so that the entire expression evaluates to true. This concept is fundamental in fields like computer science, particularly in areas such as artificial intelligence and mathematics. The most common form of satisfiability is Boolean satisfiability, where variables can be either true or false. The problem of determining whether a given Boolean formula is satisfiable is known as SAT, and it has significant implications in algorithm design and theoretical computer science.