Case Study 4: 'Depth of Field' and Aperture Example

Depth of Field: It means that only a part of your picture will be in focus and the rest will be blurred. The example below is a very shallow depth of field and was taken with an aperture of f/4.8. Aperture number around f/22 means that most of your image will be in focus irrespective of your camera location and it's distance from the object. 

Exif Data:
For both the pics... (The only difference is that I focused on the leaves in the first one and on the backdrop in the other one)
Aperture: f/4.8
Shutter Speed: 1/125s
Focal Length: 116 mm
ISO: 200