Which is best for you, on-grid and off-grid

What's the First thing that comes to your mind when you hear the word "off-grid" and "on-grid" ?
Pardon, What does it mean to be off grid?  What is difference between on grid and off grid?
Let me clarify something for you. 👇👇
What is On grid ?
A home that is connected to locally provided power source is considered “On-grid”. 
An on-grid can be practical if the following conditions exist:
You live in an area with an average annual wind speed at least 10 mph (4.5m/s). Utility-supplied electricity is expensive in your residential area. The utility’s requirement for connecting your system to its grid are not prohibitively expensive.

Photo credit: taiwantrade

What is off grid?
Systems are not connected to a local utility supplier are known as “off-grid”.
An off-grid can be practical if the following conditions exist:
You live in an area with an average annual wind speed at least 9 mph (4m/s).
A grid connection is not available or expensive. You would like to gain energy independence from the utility.