What is MOAB, 'Mother of All Bombs,' and what is it capable of

What is the MOAB?

The Pentagon said Thursday that U.S. forces in Afghanistan dropped the military’s largest non-nuclear bomb on an Islamic State target in eastern Afghanistan. This is the first time a Massive Ordnance Air Blast bomb (MOAB) has been used in combat. 

The Pentagon says the bomb was dropped on a cave complex believed to be used by ISIS fighters in the Achin district of Nangarhar province, very close to the Pakistan border.