1) This might answer your question about what the Fediverse is: https://fedi.tips/what-is-mastodon-what-is-the-fediverse

2) Yes, the idea of the Fediverse is to use a federated structure similar to the phone network or email. Whichever provider you use, you can seamlessly communicate and interact with people who use other providers.

3) You don't need to have accounts on other instances, for the same reason you don't need to have email accounts on other email providers, or SIMs from other phone providers.

Thank you @FediTips for replying. I am a new fediverse user - need help with the following.

I get the idea of fediverse - but only partially after reading wikipedia.

1) What exactly is #fediverse? There are so many instances in it. I currently have accounts in infosec.exchange and mastodon.social, what about other instances? Should I join others too?

2) I am in an infosec.exchange instance, but I am able to see posts from other instances too. So would people in other instances be able to see my posts too?

3) Will I be able to post in other instances without creating an instance specific account? Why and when should I create one?

That's all for now. These are my doubts and need #help with it.

Welcome Dream Walker, feel free to ask if you want help with anything specific

Thank you very much comrade. I will do it for sure.

A great next step is to follow @FediTips for excellent, step-by-step advice on how things work here. You can also dig in at your own pace at the website linked in their bio.

There are some good people here. Best wishes on making a good home in Fedi.