How many types of CPU sockets exist?

There are two primary types of CPU sockets commonly recognized in computer architecture:

1. Pin Grid Array (PGA) – where the pins are located on the bottom of the CPU and fit into corresponding holes in the socket.
2. Land Grid Array (LGA) – where the pads are on the CPU and make contact with the pins in the socket.

Different CPU manufacturers use various socket designs compatible with their processors, but fundamentally, they fall into these two categories. While there may be additional variations and proprietary designs from different manufacturers, the core distinction remains between PGA and LGA types. This classification provides a clear understanding of how CPUs interface with motherboards, which is crucial for compatibility in system assembly and upgrades.