Define and explain the characteristics of Arabic letters

Question
Define and explain the characteristics of Arabic letters
Answer
You can find the names and groups of the letters and their articulation points at the following link:
http://www.abouttajweed.com/tajweed-rules/32-articulation-points-and-articulation-areas-of-the-arabic-letters/19-places-of-articulation
You can open this link and then follow the links at the bottom for the next pages.

You can find the characteristics of the Arabic letters beginning at the link below.  You will also need to click on the links at the bottom to continue to the next page to view them all:
http://www.abouttajweed.com/tajweed-rules/52-the-characteristics-of-the-arabic-letters/49-the-characteristics-of-the-letters-part-1