Is it a must to have a screed on top of concrete slab?

A screed is not always mandatory on top of a concrete slab, but it is often recommended for enhancing surface finish and leveling. It helps to create a smooth, even layer that can improve the performance of flooring materials, such as tiles or carpets. Additionally, a screed can aid in moisture management and insulation, depending on the project's requirements. Ultimately, the decision to use a screed depends on the specific application and desired outcomes.