Both logic app and function app are serverless concepts in Azure, where it is availalble as PAAS in Azure. The key difference is Logic App provides you with UI designer and connectors for software services, where you can design your business logic via UI. Function App in other hand it allows you to design your own API services using custom code (Python, CSharp, TypeScript, Java, F#, Powershell, Python). Usually you go with Function App if any avaialble connector in Logic App doesn’t satisfy the particular use case or if the connector is not available.

Hi Venkat,

This article explains the difference in detail about logic apps and function app

https://walkerscott.co/2020/03/azure-logic-apps-vs-azure-functions/

Both Azure Logic apps and Azure functions are part of the Azure Serverless offering. This article compares both offerings and defines the differences, when to use one vs another etc.

https://www.serverless360.com/blog/when-to-use-logic-apps-and-azure-functions