The team is a group of people working together to achieve a shared goal.
A group of people working together without shared goal is not a team.

My first team is formed by my brother and I during tennis tournaments.
Two guys working together to achieve a shared goal: win. Which has sometimes become: partecipate.
I suggest not working alone, but always working together.

Below three heroes that placed the team before the idea.
They wanted to do something together and at the end they chose something close their skill.

Computer science is grateful for this.

From left: Rod Canion, Jim Harris and Bill Murto