Pedantically, it is the file system that is a type of database. Traditionally, database is the low-level generic term, referring to any type of structured data

Pedantically, it is the file system that is a type of database. Traditionally, database is the low-level generic term, referring to any type of structured data stored on a computer. File system, also known as the hierarchical database, adds additional specificity, referring to a particular structuring of data. Another common one is the relational database, offering another particular structuring of data.