The difference between match_parent and fill_parent?

Many people say that many projects in the match_parent appear in the layout is not clear, in the past only fill_parent and wrap_content so match_parent exactly what type? In fact, from the beginning of Android 2.2 fill_parent renamed Match_parent, from the API level of 8 we can directly use match_parent instead of fill_parent, finally Android123 remind you, Their definition is essentially the same as-1, just a different alias, perhaps to be more accurate, such as the final definition in the SDK is:

Fill_parent-1 The view should is as big as its parent (minus padding). This constant are deprecated starting from API Level 8 and are replaced by match_parent.
Match_parent-1 The view should is as big as its parent (minus padding). Introduced in API level 8.
Wrap_content-2 The view should is only a big enough to enclose its content (plus padding).

The difference between match_parent and fill_parent?