Simplify the following text for a Grade 11 native English-speaking person.
Original: Non-Euclidean geometry systems differ from Euclidean geometry in that they modify Euclid 's fifth postulate , which is also known as the parallel postulate .
Simplified: Non-Euclidean geometry is a type of geometry . Non-Euclidean geometry only uses some of the `` postulates '' ( assumptions ) that Euclidean geometry is based on .