What is the language targeting at Adwords?

[atakala]

Hey guyz,

I've used the adwords for the my organic seo keyword research. As you guyz do

And I noticed that I don't really know to what does language targeting do ?
I mean what is the function of it . 
I know that when we change the language targeting I mean setting it English from global doesn't change the volume of the search data .
So why is there ?

[TheeDigital]

I believe it is used to target not necessarily search terms in another language, but users who have an interface in another language.

[TomRayner]

For some terms it will change search volume.  For example, a generic term like "casino" will have (or should have) a greater search volume for a "global" search than just an "english" search - because more than 1 language uses the word "casino".

For other terms like "best IT company in London", it's not going to change much, if at all.

[David-Kley]

This is to target a language specifically. A better explanation of how to utilize this feature is at the link at the bottom of this post. But first, a few snippets:

"your ads can appear for customers who use Google products and third-party websites in the languages that your campaign targets. This helps ensure that your ads will appear on sites that are written in the language of the customers you'd like to reach."

"Let's say you sell coffee beans online, and you want to target Spanish-speaking customers. You set up an AdWords campaign targeted to the Spanish language, with Spanish ads and keywords. As long as your customers' Google interface language settings are set to Spanish, your coffee ads can show when your Spanish language customers search for your keywords."

https://support.google.com/adwords/answer/1722078?hl=en