DIMM (dual in-line memory module) connectors are physical connectors used to connect memory chips to a PC's motherboard. They are designed to facilitate the installation and removal of memory chips while the PC is still running. DIMM connectors come in different sizes, such as 72-pin, 100-pin, and 184-pin, which are all used in different types of RAM modules. The number of pins a DIMM connector has depends on the type of RAM being used. For example, a DIMM connector with 72 pins is used to connect SDRAM or DDR RAM, while a 100-pin connector is used for DDR2 memory. DIMM connectors can also be categorized as ECC DIMMs, Non-ECC DIMMs, and ECC Registered DIMMs. The type of DIMM connector used depends on the type of memory being used and the configuration of the system.