LGA 1151 is a type of CPU socket used by Intel for their processors. It was introduced in 2015 and supports several generations of Intel Core processors, including the 6th and 7th generation (Skylake and Kaby Lake) as well as the 8th and 9th generation (Coffee Lake). This socket features 1151 pins that connect the CPU to the motherboard, allowing for communication between the two. It is important for users to ensure compatibility between their chosen processor and motherboard, as different generations may have varying support for features and performance.