Everything is an illusion - a Maya. What does this mean?

The concept of 'Everything is Maya' is rooted in Hinduism; it literally means 'illusion’.

Many misunderstand the concept of Maya; asking, “If I can touch and feel my car, house, self and people around me, how is this an illusion?”. The answer: all these things are real, but the idea (memory) of "my-ness” nurtured by our brain to them is unreal. If that memory (even our name) is wiped out, any attachment or identity associated with it is gone. 

Maya is anything that can be erased.