Steel is used in construction for a number of reasons. Some of the main benefits of using steel in construction are:

1. Strength: Steel is one of the strongest and most durable materials available, making it an excellent choice for construction.
2. Versatility: Steel can be molded into a variety of shapes and sizes, making it suitable for use in a wide range of construction projects.
3. Speed of construction: Steel structures can be erected quickly and efficiently, reducing the time required for construction.
4. Cost: While the initial cost of steel may be higher than other materials, the overall cost of a steel structure is often lower due to the speed of construction and the reduced need for maintenance.
5. Sustainability: Steel is a recyclable material, making it a more sustainable choice for construction.
6. Fire resistance: Steel is resistant to fire, which can be an important factor in the construction of buildings.

Overall, the strength, versatility, speed of construction, cost-effectiveness, sustainability, and fire resistance of steel make it a popular choice for use in construction.