NoSQL Databases are a type of database designed to handle large volumes of unstructured or semi-structured data. Unlike traditional relational databases, which use tables and fixed schemas, NoSQL databases offer flexibility in how data is stored and accessed. This makes them ideal for applications that require rapid scaling and can accommodate various data types, such as social media platforms and big data analytics. There are several types of NoSQL databases, including document stores, key-value stores, column-family stores, and graph databases. Each type serves different use cases, allowing developers to choose the best fit for their specific needs. This versatility has made NoSQL databases increasingly popular in modern software development.