There are many types of computer as
These are used by single user or they are generally found at home use.
They are found in small industry, office, institute, etc. But the speciality is they are multiuser system and all are connected to form a workstation / network.
MINI COMPUTERS / SERVERS
They are used in office, banks, companies etc to store their data and can be retrieved by any one from these devices ( 250 users can connect).
Other than these we find some more types as
2 IN 1 PC