GCF, or Greatest Common Factor, refers to the largest positive integer that divides two or more numbers evenly. There are several other terms that are often used interchangeably with GCF. For example, the term HCF, which stands for Highest Common Factor, is frequently used in the United Kingdom and other parts of the world. Additionally, the term GCD, or Greatest Common Divisor, is commonly used in computer science and mathematics. Other synonymous terms include Greatest Common Measure, Highest Common Divisor, and Highest Common Measure. Regardless of the terminology, finding the GCF is an essential skill for solving problems involving fractions, simplifying expressions, and factoring polynomials.