Define printmaking. what are the two main types of printmaking? define both types.

Printmaking is the activity or occupation of making pictures or designs by printing them from specially prepared plates or blocks. 
The four main types of printmaking are Lithography and Intaglio
Lithography is printing from a stone or a metal plate with a smooth surface it can be used to print text or artwork onto paper or other surface material.
Intaglio is the family of printing and printmaking techniques in which the image is incised into a surface and the incised line or sunken area holds the ink it is the direct opposite of a relief print.
Relief printing is printing from raised images as in letterpress and flexography.
Screen printing is where you face ink or metal onto (a surface) through a prepared screen of fine material so as to create a picture or pattern.
 Hope this helps you

What i think is that it adds loudness for preachers/church choirs. it is also able to hold up a lot of weight without pillars. : )) idek tho