USB accessories or USB peripherals are devices that are connected to a computer using a Universal Serial Bus (USB). They are often used to add functionality to a computer or replace older technologies. USB accessories can be divided into two main categories: input devices and output devices. Input devices allow users to control the computer or supply information to the computer. Examples include keyboards, mice, and game controllers. Output devices allow the computer to show information or audio-visual content to the user. Examples include speakers, microphone, webcams and game consoles. USB accessories are easy to use, as most computers and laptops come with USB ports as standard. A simple USB connection is often all that is needed to add the functionality of a device, eliminating the need for additional hardware or software. USB accessories have revolutionized the way that we use our computers, giving us the ability to easily add extra features and capabilities whenever we need them. From USB speakers to gaming controllers, USB accessories have provided us with a myriad of options for a more comfortable, powerful and enjoyable computing experience.