We can use emailSimple REST API to send emails from Salesforce platform.

Path:

/services/data/v53.0/actions/standard/emailSimple

HTTP Method:

POST

Body:

{
  "inputs" : [
    {
      "emailBody" : "Email body",
      "emailAddresses" : "email addresses separated by coma(',')",
      "emailSubject" : "Subject",
      "senderType" : "CurrentUser"
    }
  ]
}

Reference Link:

https://developer.salesforce.com/docs/atlas.en-us.api_action.meta/api_action/actions_obj_email_simple.htm

Example:

Output: