What are 2 ways to classify a structure?

What are 2 ways to classify a structure?

Two ways to classify a structure are:

1. Based on the material used: This classification divides structures based on the materials used in their construction, such as concrete structures, steel structures, wooden structures, and masonry structures.
2. Based on the function: This classification divides structures based on their intended function, such as buildings, bridges, dams, tunnels, and towers.