Simplify the following text for a Grade 6 native English-speaking person.
Original: Netflix 's success has inspired a number of other DVD rental companies both in the United States and abroad , but none of the purely online companies appear to approach Netflix in terms of market share or revenues . Wal-Mart began an online rental service in October 2002 , but left the market in May 2005 and now has a cross-promotional arrangement with Netflix .
Simplified: Netflix is an online movie rental service .