In general, GPA plays a small part of how we evaluate an applicant profile. Very low GPA is very indicative of one's academic performance. However, high GPA in many case does not translate to a higher probability of admission.
There are many things taken into account when we evaluate GPA. It's one thing having high GPA in a super competitive institution, it's another having a 4.0 from a community college. It's one thing to have high GPA from one of the Ivy schools that are known for grade inflation, it's another to have relatively lower GPA but with other credentials to make up.