What is the most commonly used steel beam?

Could you please elaborate on what type of steel beam is the most widely utilized in various construction projects? Is it the I-beam due to its strength and cost-effectiveness, or perhaps the W-beam for its ability to handle heavier loads? Or is there another type that's gaining popularity due to its unique characteristics? Could you also discuss any advantages or disadvantages of the most commonly used steel beam? It would be helpful to understand its suitability for different applications and its impact on the overall structural integrity of a building.