Hello @Anandazure ,
you want to react to incoming blobs in your Azure data lake (the blob storage).
Azure Functions is a great way to execute code based on incoming blobs.
The Azure Function is just a piece of code triggered by some event that happens in Azure. Even blob storage can trigger an Azure function.
An example of a blob storage trigger is seen here.
If you only want to execute some code once in a while, the timer trigger is a very good solution.
MS Learn offers multiple modules on how to work with Azure Functions. I recommend checking these out, for example this one.