USB 4.0 is the latest version of the Universal Serial Bus standard, designed to improve data transfer speeds and connectivity. It can achieve speeds of up to 40 Gbps, which is double that of its predecessor, USB 3.2. This makes it ideal for high-performance devices like external hard drives and displays. Additionally, USB 4.0 supports multiple data and display protocols, allowing users to connect various devices through a single port. It is compatible with previous USB versions, ensuring that older devices can still be used. This versatility makes USB 4.0 a significant advancement in technology.