During an upgrade, there is a setting for the table prefixes to use for the database table.
Is it a must to use table prefixes? What does using that setting help with?
It means that if you were to install another Drupal, 7 or 8 on the same database (zentech0_Benia), using prefix will prevent causing confusion/collision.
having two tables named accesslog is confusing.
while having site1_acesslog, site2_acesslog you know which accesslog belongs to which site.
In conclusion, if you don't plan on installing another Drupal 7 or 8 in zentech0_Benia, (having 2 websites in the same database) then you don't need table prefixes.