Joining refers to participating in an activity, usually an ongoing activity, especially with others, usually a small activity.

Participation refers to taking part in an activity, and the participants have a positive attitude and play a certain role, usually a large-scale activity.

Example comparison:

join

1, I hope everyone can join in the fun.

I hope everyone can join in and have a good time.

He started singing, and I joined in.

He began to sing, and then I sang along.

When we play video games, he will join in from time to time.

When we play video games, he occasionally plays with us.

join

You can take part in activities ranging from canoeing to bird watching.

You can take part in all kinds of activities, from canoeing to bird watching.

If you want knowledge, you must take part in the practice of changing reality.

If you want to have knowledge, you must take part in the practice of changing reality.

3, cadres to different grass-roots units to participate in labor.

Cadres go to grass-roots units to participate in labor respectively.