You can easily extend your application with Intelligence by using one of the Cognitive Services like:

• Search – web, visual, entity, news, custom, image, autosuggest
• Speech, speech to text, text to speech, translation, recognition

• Vision, face, content moderator, and custom vision
• Language, text analytics, translator, spell check, understanding
• Knowledge, QnA, custom decision

Had here for getting started with Cognitive Services: https://docs.microsoft.com/en-us/azure/cognitive-services/.

Where I have used them:

• Added speech to text for dictation in medical application
• Added search to pharmaceutical application for looking up medications

Cognitive Services SDKs packages:

• Vision: Microsoft.Azure.CognitiveServices.Vision.ComputerVision
• Speech: Microsoft.CognitiveServices.Speech
• Text: Microsoft.Azure.CognitiveServices.Language.TextAnalytics

As you can see they help you add learning algorithms to your applications with minimal effort.