[Rails] Switch between environments

Hi All,

It is my understanding that there are 3 environments built-in to Rails
(Test, Development[default], Production).

Can someone please explain exactly how you switch between them
(specially between Development and Production)?

Let's say I use the default Sqlite3 database for both Development and
Production; what are the exact steps to push out the completed site so
it's viewable via Apache web server (instead of WEBrick)

Please excuse my ignorance but it seems rather difficult to find a
concise answer to this question anywhere.

Thank You Very Much.

~Kal

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