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_If you are familiar with ATProto already, [skip ahead](#setting-up-a-pds)._

     

       
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Atproto is decentralised in a way that differs from other solutions like [ActivityPub](https://en.wikipedia.org/wiki/ActivityPub), which services like Mastodon implement.

     

       
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There are multiple parts that work together and can be hosted separately.

     

       
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Let's go over some rough definitions for the important bits, you'll find better explanations in the [atproto docs](https://atproto.com/guides/glossary).

     

       
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In atproto's decentralisation model, there are multiple parts that work together and can be hosted separately.

     

       
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This differs from other solutions like [ActivityPub](https://en.wikipedia.org/wiki/ActivityPub), which services like Mastodon implement.

     

       
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Dan Abramov, who previously worked at Bluesky, made a [good write-up explaining the difference](https://news.ycombinator.com/item?id=45077986).

     

       
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Let's go over some rough definitions for the important bits. You'll find better explanations in the [atproto docs](https://atproto.com/guides/glossary).

     

       
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#### PDS

     

       
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