A slot is a connection dedicated to one user on a server. For example, a 4 slots server will be able to welcome up to 4 users at the same time.

Local multiplayer involves multiple players on different devices but within the same physical location, like players on separate computers or consoles in the same room. These devices are connected either through a local network (like Wi-Fi) or by directly connecting them with cables (like Ethernet or HDMI cables).