What is ServiceDefinition.csdef file?

Answer:

This is definition file for the cloud service. This file contains setting like bindings, settings etc.It also contains the information about the EndPoints and the default port number.

<?xml version="1.0" encoding="utf-8"?>

<ServiceDefinition name="AzureCloudService3" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceDefinition" schemaVersion="2015-04.2.6">

  <WebRole name="WebRole1" vmsize="Small">

    <Sites>

      <Site name="Web">

        <Bindings>

          <Binding name="Endpoint1" endpointName="Endpoint1" />

        </Bindings>

      </Site>

    </Sites>

    <ConfigurationSettings>

      <Setting name="Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString" />

    </ConfigurationSettings>

    <Endpoints>

      <InputEndpoint name="Endpoint1" protocol="http" port="80" />

    </Endpoints>

  </WebRole>

</ServiceDefinition>