PCIe slots are used to connect graphics cards, sound cards, other interface cards and some SSDs to PC motherboards. This video explains everything you need to know about PCIe slots, including PCIe slot sizes, lanes, versions and compatibility. Also included is a quick history of motherboard expansion slots from ISA to PCIe.
The video I mention at the end about PC motherboards is now uploaded here: /watch?v=sewt2pqc3us
You may be interested in some of my other shows on PC hardware, including:
SSD Life Expectancy: /watch?v=-XZNr7mS0iw
WD Black NVMe SSD (which explains NVME & M.2 in addition to reviewing this particular drive): /watch?v=kvHUVcgo8xY
More videos on computing and related topics can be found at: http://www.youtube.com/explainingcomputers
And I have another YouTube channel called ExplainingTheFuture at: http://www.youtube.com/explainingthefuture