Composite Resources | REST API Developer Guide

Composite
Executes a series of REST API requests in a single call. You can use the output of one request as the input to a subsequent request. The response bodies and HTTP statuses of the requests are returned in a single response body. The entire series of requests counts as a single call toward your API limits.

Composite Graphs
Composite graphs provide an enhanced way to perform composite requests, which execute a series of REST API requests in a single call.

Batch
Executes up to 25 subrequests in a single request. The response bodies and HTTP statuses of the subrequests in the batch are returned in a single response body. Each subrequest counts against rate limits.

sObject Tree
Creates one or more sObject trees with root records of the specified type. An sObject tree is a collection of nested, parent-child records with a single root record.

sObject Collections
Executes actions on multiple records in one request. Use sObject Collections to reduce the number of round-trips between the client and server. The response bodies and HTTP statuses of the requests are returned in a single response body. The entire request counts as a single call toward your API limits. This resource is available in API version 42.0 and later.