QSFP28 is a type of high-speed optical transceiver used in data centers and networking equipment. It supports data rates of up to 100 Gbps, making it suitable for applications that require fast data transmission, such as cloud computing and big data analytics. The "QSFP" stands for "Quad Small Form-factor Pluggable," indicating its compact design and ability to connect multiple channels. This transceiver typically uses fiber optic cables to transmit data over long distances with minimal signal loss. It is commonly used in Ethernet and InfiniBand networks, providing a reliable solution for high-bandwidth connections. The QSFP28 is an evolution of earlier models, offering improved performance and efficiency.