Types or classes of larger servers include , which are generally optimized for data storage and I/O capability, and , which are generally optimized for computational capacity and speed.

The answer is "Mainframe, Supercomputer"

Explanation:

Mainframe:

These computers are mainly used in large companies for vital purposes like bulk processing of records, for instance, censuses, business stats, and customer statistical analysis, company management preparation and transaction handling.

Supercomputer:

These types of computer used in scientific researches, oil and gas development, translating satellite information into maps showing where and how to drill oil or gas wells. These are used in applications for mechanics, for example, fluid dynamic equations of drag and hydrodynamic performance vehicles.