Abaqus is the most advanced and full featured finite element software, PERIOD.
Finite Element Analysis (FEA) is a technique where geometry from Computer Aided Design (CAD) is discretized into finite elements. This is similar to how a picture is broken up into individual pixels. The collection of finite elements are referred to as a mesh. What FEA provides is a way to simulate how a structure will respond to stimuli such as force, pressure or temperature. This alleviates or reduces the need for physical testing while providing a greater level of insight to the physics occurring in the design.