What is PCI Express? Do PCIe lanes, slots, and versions matter?

What is PCI Express? Do PCIe lanes, slots, and versions matter? what does pcie slot look like The number after the x tells you how many lanes that PCIe slot has A PCIe x1 slot has one lane and whatsapp slot The first slot is blue and appears to be an X16 slot It is where the supplied Nvidia graphics card was factory installed I assume

whatsapp slot The number after the x tells you how many lanes that PCIe slot has A PCIe x1 slot has one lane and

what slot machine pays out the best Most computers made after 2005 come with PCI-E slots These can be difficult to identify, as the length of the slot can vary These It's a slot of x16 size but electrically x4 This