Cloud Bigtable is a sparsely populated table that can store billions of rows and thousands of columns to store terabytes or petabytes of data. It utilizes a key-value system rather than a true row-store or column-store table. It supports high I/O with low latency and is optimal for map reduce. A single key-value pair can have multiple timestamped entries for versioning. It's integrable with [[Hadoop]], [[Hbase]] and [[MapReduce]]. All client requests are handled by a front-end server pool. The Bigtable instance is organized into clusters and nodes. Add nodes to handle more simultaneous requests. Nodes are pointers to tablets on Colossus, which is Google's internal storage system. Read more about the architecture [here](https://cloud.google.com/bigtable/docs/overview).