A family of Microsoft relational database management systems designed for ease of use.
They just have a single user.
Even in a single user environment I would strongly recommend that the database be split into front and back ends. By isolating the tables containing the data from the interface, in the event of the latter becoming corrupted, which is not uncommon, the data will be preserved intact. All that is necessary is to replace the corrupted front end with a clean copy made form a 'master' copy kept in a secure location. For further details see the following link:
Another advantage of splitting the file is that it makes it very easy to make regular backups of the data from within the front end. For an illustration see BackupDemo.zip in my Dropbox public databases folder at: