What is HTAP (Hybrid transactional/analytical processing)?

A new term coined recently to combine the transactional and analytical power into a single system. Traditionally, transactional and analytical processing are handled by different systems, which causes the headache of maintaining 2 separate systems as well as duplicating the data and managing the pipeline to copy the data from the online transactional system to the analytical system. HTAP gains popularity because it eliminates the duplicate system and data, making near real-time analytic possible. On the other hand, the challenge still remains as how to efficiently handle both transactional and analytical workload in the same system, and how to prevent analytical workload interfering with online transactional processing.