PCI Express 4.0 is a high-speed interface standard used to connect various hardware components in computers, such as graphics cards and storage devices. It offers double the data transfer rate of its predecessor, PCI Express 3.0, reaching speeds of up to 64 gigabits per second (Gbps). This increased bandwidth allows for faster communication between components, improving overall system performance. The standard is particularly beneficial for applications requiring high data throughput, such as gaming, video editing, and data-intensive tasks. Many modern motherboards and devices now support PCI Express 4.0, making it a key feature for users looking to enhance their computing experience.