SO-DIMMs, or Small Outline Dual In-line Memory Modules, are a type of computer memory specifically designed for laptops and compact devices. They are smaller than standard DIMMs, making them ideal for space-constrained environments. SO-DIMMs typically come in various capacities and speeds, allowing for efficient performance in portable systems. These memory modules connect to the motherboard via a 204-pin or 260-pin interface, depending on the type. SO-DIMMs are commonly used in laptops, mini PCs, and networking devices, providing a balance of size and performance to meet the needs of mobile computing.