I want know what exactly rat race is and why most of the people fall into that trap?
Wikipedia page says,
A rat race is an endless, self-defeating, or pointless pursuit. The phrase equates humans to rats attempting to earn a reward such as cheese, to no avail. It may also refer to a competitive struggle to get ahead financially or routinely.
The term is commonly associated with an exhausting, repetitive lifestyle that leaves no time for relaxation or enjoyment.
In his book Rich Dad Poor Dad, author wants people to get ahead of the rat race by properly managing their Cash Flow or by increasing Assets.