Different between shared server and dedicated server

could you explain difference between shared server and dedicated server.

Oracle has two modes, a shared server mode and a dedicated server mode. In dedicated server mode (the default), the Oracle server creates one process per connection.
This quickly limits the number of connections the Oracle Server can support due to the following:
1.There is an OS limit on how many processes/file descriptors can be supported
2.Oracle has an internal PROCESSES parameter that prevents it from launching more than the specified number of processes.
When it is anticipated that these limits may be exceeded, which frequently happens for 50-100 concurrent connections, you should either configure Oracle in shared server mode or increase the limits above, so that many concurrent connections can be supported by each Oracle process. Oracle states that running in shared server mode is slightly slower than in dedicated server mode.

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