Use REST API composite resources are helpful to improve application’s performance by minimizing the number of round-trips between the client and server.
All the series of rest apis are counted as a single call towards your API limits. This is executed in the context of the same user.
<ol>
<li>Series of REST API requests in a single call.
</li>
<li>Multiple CRUD Operations
</li>
<li>Output of one request as the input to a subsequent request.
</li>
<li>Response bodies and status in a single response body.
</li>
<li>Counts as a single call toward your API limits.
</li>
<li>Executed in the context of the same user. 
</li>
</ol>
<h3 id="heading-composite-request-body">Composite request body</h3>
Here you are seeing an example of a composite request body
<pre><code class="lang-javascript">{
 "allOrNone" : true,
 "collateSubrequests": true,
 "compositeRequest" : [
 { Composite Subrequest},
 { Composite Subrequest},
 { Composite Subrequest}
 ]
}
</code></pre>
<h3 id="heading-composite-request-response">Composite request response</h3>
<pre><code class="lang-javascript">{
 "compositeResponse" : [
 { Composite Subrequest Result },
 { Composite Subrequest Result },
 { Composite Subrequest Result }
 ]
}
</code></pre>
<h3 id="heading-type-of-composite-resources">Type of Composite Resources</h3>
There are different composite resources available
<ol>
<li>Composite API
</li>
<li>Batch
</li>
<li>SObject Tree
</li>
<li>SObject Collection
</li>
<li>Grapths
</li>
</ol>

Use REST API composite resources are helpful to improve application’s performance by minimizing the number of round-trips between the client and server.

All the series of rest apis are counted as a single call towards your API limits. This is executed in the context of the same user.

1. Series of REST API requests in a single call.
    
2. Multiple CRUD Operations
    
3. Output of one request as the input to a subsequent request.
    
4. Response bodies and status in a single response body.
    
5. Counts as a single call toward your API limits.
    
6. Executed in the context of the same user. 
    

### **Composite request body**

Here you are seeing an example of a composite request body

```javascript
{
   "allOrNone" : true,
   "collateSubrequests": true,
   "compositeRequest" : [
     { Composite Subrequest},
     { Composite Subrequest},
     { Composite Subrequest}
   ]
}
```

### **Composite request response**

```javascript
{
   "compositeResponse" : [
      {  Composite Subrequest Result },
      {  Composite Subrequest Result },
      {  Composite Subrequest Result }
   ]
}
```

### **Type of Composite Resources**

There are different composite resources available

1. Composite API
    
2. Batch
    
3. SObject Tree
    
4. SObject Collection
    
5. Grapths

Salesforce Composite resources