Trigonometry is a branch of mathematics that studies the relationships between the angles and sides of triangles, particularly right triangles. It uses functions like sine, cosine, and tangent to help solve problems involving angles and distances. These functions are essential in various fields, including physics, engineering, and architecture. The word "trigonometry" comes from the Greek words for "triangle" and "measure." It has practical applications in real life, such as in navigation, where it helps determine positions on Earth, and in computer graphics, where it aids in rendering images and animations.