Which beam is characterized by thick sections at the top and bottom connected by a thinner section?

The I-beam is characterized by its distinctive shape, which resembles the letter "I". This design includes thick sections at the top and bottom, known as the flanges, which provide strength and help resist bending. The thinner section in the middle is called the web, which connects the flanges and contributes to the beam's overall structural integrity while keeping the weight lower.

This configuration allows the I-beam to efficiently carry loads while minimizing material use. In construction and engineering, the I-beam is commonly used due to its ability to span long distances without excessive deflection, making it a preferred choice for girders, floor beams, and other structural applications.