M.2 is a specification for a small form factor interface designed to connect various hardware components, primarily used in computers and laptops. It allows for faster data transfer rates compared to older interfaces like SATA, making it ideal for solid-state drives (SSDs) and other devices such as Wi-Fi and Bluetooth cards. The M.2 connector is versatile, supporting different sizes and types of devices. It can accommodate various protocols, including PCIe and SATA, enabling users to choose the best option for their needs. This flexibility has made M.2 a popular choice for modern computing systems.