A function endpoint is the publicly available URL on which you can access the function.
In Azure serverless computing (unlike in some serverless offers provided by other vendors), HTTP(s) endpoints are assigned automatically to all the functions that have an HTTP or a Webhook trigger, without a need for an API Gateway. By default, the function is assigned an endpoint constructed in the following manner, based on your application and function name:
http://<YourAppName>.azurewebsites.net/api/<FunctionName>