# REST API

All Marketing Cloud Engagement features implement REST API. REST API uses JSON request and response bodies and resource endpoints. REST calls are synchronous. For a list of REST API endpoints and properties, see [REST API Reference](https://developer.salesforce.com/docs/marketing/marketing-cloud/references).

You can use REST API to manage several important marketing activities.

- Creating, reading, updating, and deleting contacts
- Managing content in Content Builder
- Interacting with Journey Builder
- Configuring and sending messages with Mobile Connect and MobilePush
- Managing campaigns
- Creating Triggered Sends (also available in SOAP API)

There are limits that apply to your use of REST API. For more information, see [API Limits and Guidelines](https://help.salesforce.com/s/articleView?id=mktg.mc_overview_limits_api.htm).