What is Oracle GoldenGate?

I was looking for a short & crisp answer to the question what is Oracle Golden Gate which could be called a defination of the product as well.

Oracle GoldenGate replication technology that’s now part of the Oracle framework, is a high-performance software application for real-time transactional change data capture, transformation, and delivery, offering log-based bidirectional data replication. The application enables you to ensure that your critical systems are operational 24/7, and the associated data is distributed across the enterprise to optimize decision-making.
Oracle GoldenGate filled a gap which we did not have - heterogeneous replication, replication from Oracle to different databases and vice versa.Oracle Goldengate can be used as a replication tool, ETL, and even as a DR solution.One can move data between similar or dissimilar supported Oracle versions, or one can move data between an Oracle database and a database of another type. GoldenGate supports the filtering, mapping, and transformation of data.