I'm no expert but I'll have a bash:
studio monitors...
is it (sic) the same as a regular speaker -
NO they are built to have a flat, as in accurate, response to the signal. Listen to any set of stereo system speakers and they'll have more bass or less treble or visa versa - hence the need for a loudness switch for many stereos as the speakers don't reproduce the sound as accurately at low volumes. It's a bit like why people prefer tube/valve amps - the "warmth" or "colouration" are in fact changes to the signal caused by the implement initially at least unintentionally - now of course they promote the fact. Back to the point Monitoring speakers shouldn't colour/warm/alter the sound.
Like you just connect the cables to your computer audio jack and voom there you go? and whats the difference between active and passive monitors? -
These are intertwined. A line from your card to active speakers will work as active speaker have built in amps. Passive speakers require an amp between the source & them. It needs to be a specifically designed amp that, again, doesn't colour the sound.
Can you do this with a home stereo? The real answer NO.
Cheapskates like me treat the room as best as possible & then set up the substitute monitor system (home stereo?) as flately as possible by adjusting parameters as much as can be to represent a flat response &/or adjusting due to indepth knowledge of the systems bias.
Oh, and a subwhoofer inexpertly set up will render real monitors pointless.
Someone please correct me.