Marks a person or entity with whom an action is jointly or reciprocally performed. It is often translated as 'with' or 'and'.
Noun + とPrimary
This word shows you are doing something with someone. It can mean 'with' or 'and'. You use it when two people or things do an action together.
週末は、よく友達と映画を見に行きます。
On weekends, I often go to see movies with my friends.
昨日、駅前で偶然、高校の時の先生と会った。
Yesterday, I coincidentally met my high school teacher in front of the station.
意見が合わないので、彼とはもう一緒に仕事をしたくない。
Our opinions don't match, so I don't want to work with him anymore.
部長と相談した結果、プロジェクトの方針を変更することになりました。
As a result of consulting with the department manager, it has been decided that we will change the project's direction.
彼は長年、難病と闘っている。
He has been fighting a difficult illness for many years.
Imagine two people holding hands to do something. The particle と shows this. It means you do an action with someone else. It is like 'with' in English.
The particle "と" is for actions you do together with someone. The particle "に" is for actions you do towards someone. For example, "to talk with a teacher" uses "と". This means you both talk. "To talk to a teacher" uses "に". This means you tell the teacher something. With "to meet", "と" means you meet each other. "に" means you go to meet someone. Do not confuse "と" with "で". "で" shows what you use to do something. Like "write with a pen".
Don't use this when you use a tool. For example, you don't say '箸と食べる' (hashi to taberu - eat with chopsticks). The word before 'と' must be a person or a group. It can also be an idea that you treat like a person. For example, you can fight an illness.
Often confused with(1)
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