Structural joints are critical connections between different parts of a structure, such as beams, columns, and slabs. They help transfer loads and forces throughout the building, ensuring stability and integrity. Common types of structural joints include welded joints, bolted joints, and riveted joints, each serving specific purposes based on the materials and design requirements. These joints can be categorized into two main types: rigid joints, which resist rotation and movement, and flexible joints, which allow for some degree of movement. Proper design and construction of structural joints are essential for the overall performance and safety of a structure, especially in areas prone to earthquakes or high winds.