How can we take a backup of mysql table and restore it?

These are the simplest method to backup and restore the MySQl table

For taking the bakup of all the databases

mysqldump --user {user} --password {password} -A > {file name to dump}

To take the backup of a specific database

mysqldump --user {user} --password {password} dbname > {filename to dump}

To restore a SQL dump please use this

mysql --user {user} --password {password} dbName < {filename to restore}