Construction is when people build things. People use special tools and materials like wood, blocks, and tools like hammers and saws to build things. For example, we can build a house by putting together lots of pieces of wood to make walls. We use hammers to put the pieces of wood together, and a saw to cut the pieces into the right size. We can also use things like paint, electrical wiring, and insulation to make it a comfortable and safe place to live in.