Depth of field and Bokeh

Depth of field 

Depth of field (DoF) is the distance between the nearest and furthest elements in a scene that appear to be "acceptably sharp" in an image. In simple words DoF is is an area of a picture in sharp focus. 

The two types of depth of fields are the following :

1. Shallow

2. Deep depth

Shallow depth of field is used for group photos and deep depth of field is used for land escapes.  

The following images are a practice of DoF: 

Bokeh

Bokeh is the aesthetic quality of the blur produced in out-of-focus parts of an image. Bokeh has also been defined as "the way the lens renders out-of-focus points of light".

The following images are a practice of Bokeh :