Answer / vijaykrishna

Application Server is server which acts as interface between
between end user and Database server . And also it is having
the several components in it. Central Instance is the
instance accessing for the Database Server through listener.
And Central Instance is one of the part of the Application
Server.

Answer / sumit kumar

central instance is a collection of several work process
such as (dwp+ewp+bwp+swp) which is connected through
dispatcher along with message server to interact with sap
user.
and application server is nothing but the collections of
central instances plus other individual instances which is
used to communicate with database system of SAP and
retreving data for the SAP users.

Answer / sanjay

why all people have given such long answers, surprise...

as per the question the answer could be Central instance is
a application server itself.

Answer / gokul

the only diff is: CI has enque lock table which requires
enque work process, which is not requirement for
application server

Answer / somasekhar.g

CI itself is a first installed application server.
and afterwards dialog instances are installed.these
CI and DI are nothingbut applicationservers.

Answer / john

AS: Is just a dialog instance.
CI: Is Dialog instance + Database Instance.

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