The area of a triangle is a measure of the space inside the triangle. It can be calculated using the formula: Area = 1/2 × base × height. Here, the base is one side of the triangle, and the height is the perpendicular distance from that base to the opposite vertex. Triangles can have different shapes, such as equilateral, isosceles, or scalene, but the area formula remains the same. Understanding the area of a triangle is important in various fields, including geometry, architecture, and engineering, as it helps in designing and analyzing structures.