You probably use databases all the time, often without knowing it. If you use a software-based accounting program, you are using a database. All accounts payable, accounts receivable, vendor, and customer information is stored in databases. Scheduling programs use databases to store appointments and to-do lists. Even email programs use databases for directory lists and folders.
These databases are designed to be hidden from you, the end user. You never add accounts receivable invoice records into a database yourself. Rather, you enter information into your accounting program, and it adds records to the database.