What is meant by saying that a package Depends, Recommends, Suggests, Conflicts, Replaces or Provides another package?

The Debian package system has a range of package "dependencies" which are designed to indicate (in a single flag) the level at which Program A can operate independently of the existence of Program B on a given system: • Package A depends on Package B if B absolutely must be installed in order to run A. In some cases, A depends not only on B, but on a version of B. In this case, the version dependency is usually a lower limit, in the sense that A depends on any version of B more recent than some specified version. • Package A recommends Package B, if the package maintainer judges that most users would not want A without also having the functionality provided by B. • Package A suggests Package B if B contains files that are related to (and usually enhance) the functionality of A. • Package A conflicts with Package B when A will not operate if B is installed on the system. Most often, conflicts are cases where A contains files which are an improvement over those in B. "Conflicts" are ...  more