Why do people recommend buying bonds, when you can just keep your money in high interest savings account?

Bonds will give you monthly/yearly interest payments, which are a good source of income for some.

Bank interest rates are subjected to changes

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The bonds are locked in at a fixed rate for a Long term.

Banks may change the terms and interest amount any time they want, usually with some notice period. Whereas bonds will pay the coupon rate for the stated period. Bonds may default though, so need to choose the bond carefully. Best if you can get some that are issued by our government if you are looking to buy some. Hope this helps

don't think any savings account in singapore gives high interest than bonds haha. also, savings accounts usually have a limit whereby they do not give the higher interest after the cap