Short answer

Application Supported by Blocked Amount (ASBA) allows you to apply for Initial Public Offerings (IPOs) or Follow-on Public Offerings (FPOs). Your application money remains in your bank account but is temporarily blocked until shares are allotted. Once shares are allotted, your bank debits the blocked amount from your account, and the remaining amount is unblocked.

You can submit your ASBA applications to Self Certified Syndicate Banks (SCSB) (WEB).