What is an slot on a motherboard used for?

What is an slot on a motherboard used for? slot m2 Currently the keys B, M, A and E together with B+M and A+E are in use The slot and the module have to support the same key in order to be compatible slot 15 bonus 15 It's worth noting that the second slot for SSDs supports

slot 15 bonus 15 An slot is a type of connector found on some motherboards that is used to connect devices, such as solid-state drives

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