Apologetics is the discipline of defending a position through the use of information. The position defended is often religious in nature and it's defenders are called apologists.

Ezekiel Bornig Kephart has written:

'Apologetics' -- subject(s): Apologetics

Andrew Davison has written:

'Imaginative apologetics' -- subject(s): Apologetics, Imagination, Christianity

Alfred Ernest Garvie has written:

'A Handbook of Christian Apologetics' -- subject(s): Apologetics

Gen is the abbreviation for Genesis. Also see "Apologen" which means "Apologetics Genesis" and "Apologetics Generation".