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+# Firebase NoSQL Database with Firebase Realtime Database
+
+Firebase is a mobile and web application development platform by Google that provides various services including a realtime NoSQL database.
+
+## What is a NoSQL Database?
+
+NoSQL databases are non-tabular databases and store data differently than traditional relational databases. NoSQL databases come in various types based on their data model:
+
+- **Document Databases**: Each entry is a document with properties and values (e.g., JSON, MongoDB).
+- **Key-Value Stores**: Simple key-value pair storage (e.g., Redis, DynamoDB).
+- **Wide-Column Databases**: Store data in columns rather than rows (e.g., Cassandra, HBase).
+- **Graph Databases**: Store data in nodes and edges (e.g., Neo4j).
+
+### Difference between SQL and NoSQL databases
+
+...
+
+## Firebase Realtime Database
+
+The Firebase Realtime Database is a cloud-hosted NoSQL database that lets you store and sync data between your users in real-time. Here are some key features:
+
+- Data is stored as JSON and synchronized in real-time to every connected client.
+- Realtime listeners can be used to subscribe to data changes.
+- Offline data persistence is supported so data is available even when offline.
+- Data is stored as JSON documents organized by key-value pairs.
+
+...
+
+### Structuring Data
+
+Data in the Realtime Database is organized into hierarchical JSON objects as key-value pairs. Keys can contain alphanumerics, underscores, dots, and Unicode characters. Values can be strings, numbers, booleans, arrays, or other nested objects.
+
+Some guidelines for structuring data:
+
+- Data should be structured as flatly as possible for efficiency. Nested data can make querying slower.
+- Unique IDs from authentication like UID can be used to store data per user.
+- Use push IDs to generate automatic keys for new data like messages in chat.
+- Add metadata like createdAt timestamp for data ordering.
+
+...
+
+### Security Rules
+
+The Realtime Database provides flexible declarative rules to define complex access controls. Rules are defined per node as JSON objects. Some capabilities:
+
+- Validate data when written or read.
+- Control access per user account with auth variables.
+- Granular read/write rules down to operation and data attributes.
+- Cascade rules inheritance to simplify rulesets.
+
+...
+
+## Summary
+
+In summary, the Firebase Realtime Database provides a flexible cloud-hosted NoSQL database for mobile and web apps. Its realtime synchronization, offline support, and security rules make it a good choice for collaborative applications.