Which type of motherboard expansion slot has four types ranging from x1 to x16 with each type having a different length of expansion slot?

The type of motherboard expansion slot you are referring to is the PCIe (Peripheral Component Interconnect Express) slot. These slots are used for adding expansion cards such as graphics cards, sound cards, network cards, and more to a computer motherboard.

Details on PCIe Expansion Slots:

1. PCIe x1: This is the smallest slot, offering one lane of data transfer. It is used for less demanding cards, such as network adapters or sound cards.

2. PCIe x4: This slot utilizes four lanes and is commonly used for higher-bandwidth devices like SSDs that require faster data transfer rates compared to x1 slots.

3. PCIe x8: This slot has eight lanes, making it suitable for more demanding applications, such as certain graphics cards or server-related hardware.

4. PCIe x16: This is the largest and most commonly used slot for graphics cards. It provides the maximum bandwidth and is essential for high-performance GPUs used in gaming or professional applications.

Each of these slots has a different physical length, corresponding to the number of lanes they support. This design helps to prevent users from inserting lower-lane cards into higher-lane slots incorrectly.