MMCX connector (Micro-Miniature Coaxial) is a small coaxial connector used to connect WiFi antennas and other radio devices. It is known for its compact size and swivel connection that allows for easy handling and installation in limited space. MMCX connectors are often used in compact and portable devices such as wireless modules and internal antennas where size and weight need to be minimized. They are also popular for their ability to provide a stable connection with minimal signal loss.