The common use of a USB port in modern devices is to facilitate data transfer and power supply between electronic devices. USB (Universal Serial Bus) technology standardizes connections, enabling users to plug and play various peripherals, such as keyboards, mice, and external storage. Additionally, USB ports can also provide charging capabilities for smartphones and tablets, making them highly versatile. Their widespread adoption across devices contributes to a more streamlined and user-friendly experience, allowing for easy connectivity and interoperability between technologies.