Albert is correct in one meaning of "to take something for granted". It can also mean "to use something without appreciation or gratitude." For instance, many Americans take clean water for granted. This means that we use a lot of clean water (baths, showers, washing the car, flushing the toilet, drinking, etc.) without realizing how fortunate we are to have 90% of the world's clean water in our country.

It means that something is assumed to be true without the need of checking it