The post office savings account is a deposit scheme offered by the postal department that pays a fixed interest rate. It allows investors to deposit funds and earn 4% annual interest, which is tax-free up to Rs. 10,000. Account holders receive benefits like cheque facilities, ATM cards, ability to open minor accounts, portability between post offices, nominations, joint accounts, and electronic services. Tax exemptions are also provided under section 80L of India's income tax act.