What is slot ?

Guide to Types of Expansion Slots and Add-In Cards expansion slot types In computers a slot or expansion slot is an engineered technique for adding capability to a computer in the form of connection pinholes typically in th expansion slot definition computer In this picture, there are three different types of expansion slots: PCI Express, PCI, and AGP PCI

expansion slot types In this picture, there are three different types of expansion slots: PCI Express, PCI, and AGP Computer motherboard How many expansion slots