Technical difference between THE WEB and PAGES FROM COUNTRY options in Google

Well this is a very simple but still its answer can be very useful for everyone. When searching in Google, you’ll find two options - one is THE WEB and second one is PAGES FROM COUNTRY(for example pages from Canada, pages from India). So I request you to tell me the technical difference between these two options of search in Google.

One returns you pages from anywhere, one returns you only pages from the country you have selected.