hi all , i'm still beginner with piano, and looking to buy a 5 Octave Organ ,

my question is : there are any differance between the sound of organ and sound of piano ?

and is it adjustable to be near from te piano sound .

i'm asking this question because i have noticed that some sheet musics played on piano is sound differant when you hear when it played on organ ,

so need explantion for that if you please ,

thank you

Zillions of electronic keyboard instruments come with both organ and piano simulations, but a real organ is radically different from a real piano.

A piano has a percussive sound and a rapid decay (or, technically, a rapid drop-off to a slow decay), whereas an organ's tone will continue, at the same volume, for as long as you depress the corresponding key. The harder you push down a piano key, the louder the sound, whereas pushing a key harder on an organ has no effect on the volume. Pianos have sustain pedals; organs don't. Playing a piano requires more finger strength than playing an organ. Organs have bass pedals; pianos don't. Organs have stops or drawbars with which to change timbre radically; pianos don't. Organs have at least two manuals; pianos have one. Pianos have eighty-eight keys; organs have significantly fewer keys (per manual, that is).

If you are going to be using an electric keyboard, than it won't be all that different from piano. (The keys on an electric feel different.) If you are ever playing a pipe organ, then you have to think about a whole slew of other stuff, such as playing with your feet.

I've never played oragan, but it looks very different from piano

If you are going to be using an electric keyboard, than it won't be all that different from piano. (The keys on an electric feel different.)

A point about terminology: An electric instrument (such an electric guitar) produces its sound mechanically then transduces it (turns it into) an electric current, which is then amplified. An electronic instrument produces its sound non-mechanically, electronically.

The most famous electric keyboard instruments are the Rhodes electric piano, the Wurlitzer electric piano, and the Hammond B3 organ, none of which have been manufactured for decades. None of these sounds anything like a piano.

As I pointed out before, you can buy all sorts of electronic keyboard instruments that have buttons on them that make the instrument sound alternately roughly like a piano or roughly like an organ. How roughly depends on the quality of the individual instrument.

My yamaha digital piano sounds very much like an acoustic piano.

Your instrument is electronic, and it uses piano samples. ("Digital" here is an abbreviation of "digital electronic" in contradistinction to "analog electronic".) It could never sound better than a digital recording of a piano (because this is what a sample actually is), and it will need to rely on speakers. Speakers inevitably distort and disfigure the original sound.

well, a digital piano never goes out of tune

Neither does a CD.