External storage refers to devices that store data outside of a computer's internal hard drive. Common examples include USB flash drives, external hard drives, and memory cards. These devices allow users to save files, back up important data, and transfer information between different computers easily. One of the main advantages of external storage is its portability, enabling users to carry large amounts of data in a compact form. Additionally, external storage can provide extra space for devices with limited internal storage, making it a practical solution for both personal and professional use.