Particle - も - Also - also, in addition, too, as much as
The particle も is used to say that something is also true. It corresponds with the English words "also" or "too", and replaces が, わ or を when used.
Other particles, such as に, may be used in combination with も, and usually, but not always, precede it.
It can also be used to set an upper limit. For example: 君の写真を撮ってもいいですか (Can I take your photo?). By adding も you especially indicate that you just want to take a photo and nothing more.
It also turns question-words (Who, What, Where) into every~/all~ words (だれも everyone, どこも everywhere)
ねこ は 黄色 です. The cat is yellow
車 も 黄色 です. The car is also yellow.
I also went to Osaka
I also went to japan
May I take your picture?
There is no problem
There is also a variety of coffee
Let's go together again next year
It is easier than I thought
I like both
I have no words to thank you
May I sit next to you?