What is a surface body in mechanical sketches?

[mech-eng]

I cannot determine where I should ask this question if here is wrong would you carry it to the correct forum?

What does a "surface body" mean? What is it?

"The Surfaces From Sketches feature allows the creation of surface bodies using sketches as their boundary."

https://www.sharcnet.ca/Software/Ansys/17.0/en-us/help/wb_dm/dm_SufacesFromSketches3DMod.html

Thank you.

 

[Nidum]

Conversion of a line sketch into a planar object bounded by the original line sketch .

 

[mech-eng]

Are the surface object and planar object the same concepts?

Thank you.