What is an Annotated Bibliography?

Merriam Webster's definition of Annotation is: a note added by way of comment or explanation  

• Ex. The bibliography was provided with helpful annotations

I found that on Owl/Perdue writing lab that the use of the annotated bibliography or citation is to summarize,   it may asses or evaluate the source and some may reflect on the source's possible uses for your assignment or work. 

SOURCES:

Merriam Webster's: this is where I found the definition of annotating and it provided the true and simple meaning so that I could apply it to more than just a bibliography.

Owl/Perdue writing lab: this source provided the use of annotating and the importance of annotating a citation and/or  bibliography