The Activity lifecycle section in the Application Fundamentals tutorial states that there are 3 states:

An activity has essentially three states:

(1. active/running 2. paused 3. stopped)

But then as I continued reading the actual Activity class documentation, the Activity Lifecycle section states that there are 4 state:

An activity has essentially four states:

(1. active/running 2. paused 3. stopped 4. "dropped"?)

Both sources (on the same website) agree about the first 3, but the 4th one is only mentioned in the class documentation and is unnamed.

So, are there really 4 states or only 3?

If there are 4, what is the name of the 4th one?

Please help me understand this discrepancy.

Also, highlighted colored blocks in this beautiful and very informative flowchart don't seem to correspond to the states. Where, in the flowchart, would you mark the 3 or 4 states?