Final answer:
An AGP slot is a dedicated port designed for graphics cards to facilitate faster communication between the GPU and the motherboard, enhancing graphics performance.
Step-by-step explanation:
The purpose of an AGP slot, which stands for Accelerated Graphics Port, is to provide a dedicated pathway for graphics cards to communicate with the motherboard. This allows for faster data exchange between the CPU and graphics processing unit (GPU), which can result in improved graphics performance, particularly for 3D applications and games. The AGP slot was designed to facilitate better handling of large amounts of graphical data and to provide a speedier rendering of graphics than the standard PCI slot of its time.