···

       
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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.

     

       
19
       
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There are multiple parts that work together and can be hosted separately.

     

       
20
       
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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).

     

       
0
       
 
       

     

       
0
       
 
       

     

       
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#### PDS

     

       
23
       
 
       


     

···

       
15
       
 
       


     

       
16
       
 
       
_If you are familiar with ATProto already, [skip ahead](#setting-up-a-pds)._

     

       
17
       
 
       


     

       
18
       
+
       
In atproto's decentralisation model, there are multiple parts that work together and can be hosted separately.

     

       
19
       
+
       
This differs from other solutions like [ActivityPub](https://en.wikipedia.org/wiki/ActivityPub), which services like Mastodon implement.

     

       
20
       
+
       
Dan Abramov, who previously worked at Bluesky, made a [good write-up explaining the difference](https://news.ycombinator.com/item?id=45077986).

     

       
21
       
+
       


     

       
22
       
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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).

     

       
23
       
 
       


     

       
24
       
 
       
#### PDS

     

       
25