Why I need to set cron job?

Cron job will perform these tasks

1. Reset reference numbers

2. Set the payment status to overdue after payment term for pending and partial paid sales/purchases

3. Delete expired products (disable/enable this in settings) o Expire product promotions after end date o Delete older login records o Check if updates are available

4. Delete expired products (disable/enable this in settings) o Expire product promotions after end date o Delete older login records o Check if updates are available