Tells you the version. You can tell what sort of release it is
from the version. For instance:
1.0.0 (1 January)
A proper released binary file at version 1.0.
1.0.0+
Built from the source based on version 1.0 (but there is no
way of knowing whether the source has been altered).
1.0.1 (2 January)
A bug fix release built on January 2nd.