Steemit Bots

Hi people, I’ve been seeing a lot of posts regarding bots on steem.

I’m pretty confused.

Are bots good or are they spoiling the ecosystem?

Can ANYONE explain what’s the purpose of the bots?

How should I use it?

What’s the minimum requirement in order for me to use it?

Do I earn more SP with bots?

Hope you’re able to help me & other newcomers who are equally confused and lost.

Many thanks in advance!