In a blog post by Mike Hartington, the integration of MongoDB's Realm with an Ionic React app is explored, focusing on leveraging Realm as a data storage solution. Realm serves as both a local database for mobile apps and a platform for syncing data with a MongoDB Atlas instance, providing serverless functions for actions like authentication. In the web context, Realm operations occur directly on the Atlas instance. The blog outlines how to set up a task tracker app using React's Context API and hooks to create a context, provider, and hook for accessing Realm, enabling user authentication and state management. The tutorial provides code examples and instructions for setting up a free Atlas database cluster and a Realm hosted application, with options to explore different app versions using GraphQL or direct API operations. The post encourages developers to explore the provided repository and experiment with the app's functionality, highlighting the flexibility and power of using Realm in modern web applications.