What is Connection in Oracle 10g Database?

Please let me know what is connection term in Oracle 10g Database in detail?
Thanks,
Waheed.

Network Connections
Oracle Net Services is Oracle’s mechanism for interfacing with the communication
protocols used by the networks that facilitate distributed processing and distributed
databases.
Connections and Sessions
Connection and session are closely related to user process but are very different in
meaning.
A connection is a communication pathway between a user process and an Oracle
instance. A communication pathway is established using available interprocess
communication mechanisms (on a computer that runs both the user process and
Oracle) or network software (when different computers run the database
application and Oracle, and communicate through a network).
Oracle® Database
Concepts
10g Release 1 (10.1)
Part No. B10743-01

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