Indicates a medium, means, or intermediary by which something happens or is communicated. Often used with nouns like インターネット, 友人, or 経験.
You can connect with people all over the world through the internet.
throughout; all through; all over
Describes something happening continuously over a period of time or across an entire area. Common with time nouns like 一年 or 一生, and location nouns like 全国.
I got to know her through a friend.
In this region, a mild climate continues throughout the year.
The singer is popular all over the country.