The ST (Straight Tip) SC (Subscriber Connector) is a type of fiber optic connector. It is a popular choice for connecting fiber optic cables due to its small size and ease of use. The ST SC connector is a push-pull type connector, meaning it is easy to connect and disconnect. It has a 2.5mm ferrule and is available in both single-mode and multi-mode versions. The ST SC connector is widely used in telecommunications, data centers, and other applications where fiber optic cables are used. It is also used in medical and industrial applications. The ST SC connector is a reliable and cost-effective solution for connecting fiber optic cables.