What products or systems are suitable for mongodb?

  mongodb, question

Or what kind of application scenario is mongodb suitable for?

MongoDB is a general-purpose online database, except for some strong transaction scenarios that require application-side cooperation, it can replace the existing OLTP database most of the time. Some commonly used applications: product catalog (e-commerce), user data management, content management, metadata management, internet of things, monitoring or log data, mobile/social applications, big data, real-time analysis (aggregation and MR), data integration, relational database caching, 360-degree information panel, LBS (geospatial index), etc. These are used by relatively large users in the production environment.