Definition - What does Database Dump mean?
In two words, Backup and Restore.
Quote :" The idea behind the SQL-dump method is to generate a text file with SQL commands that, when fed back to the server, will recreate the database in the same." pgAdmin_Backup_Restore.pdf
Users can take advantage of provided utilities to perform a database
dump. For example, in MySQL, the mySQLdump utility will produce this
result and can send the data to a remote server if necessary.