A database is fancier than a file in that it is structured and interpreted. For instance, it is structured in database records, each of which has an interpretation. The standard format for databases these days is called relational . A relational database is composed of tables of tuples of attributes that have values. Hosts to see one of the databases we use to keep our site consistent.
Hosts is a table.
Each tuple in it is a region of lines, separated by blank lines, and describes a single computer. If a song claims to be in an album, the album should show that it has that song. For example, in an airline reservation system, if two clients try to grab the last seat on a flight at the same time, it is important that not both succeed.