I just receive an offer letter from a company. In the letter, it is stated that my basic salary would be RM2XXX with an allowance of RM200.

What is the difference in between basic and allowance? They did not specifically state that it is food, petrol or traveling allowance, just a single word "allowance".

Also, they mention that both basic and allowance would be credited into my bank account, doesn't that make both of them essentially the same? Or perhaps allowance is something I will only receive if I perform exceptionally well during the month?

Problem is they did not state what allowance it is, just "allowance".