What is the difference between a keyboard and a digital piano?

Well, obviously they both emit the same sort of digital sound. But one big (and pretty obvious difference) is that digital pianos are NOT made to be portable - they are usually built to look like a regular piano. They usually weigh from 25-60 lbs, and usually come with 61, 76, or 88 keys.

Keyboards usually weigh less than 20 lbs. and have a smaller range; often made in 49 or 61 key models. They are either played on a stand or a tabletop.

Keyboards are generally cheaper than digital pianos.

Digital pianos tend to sound more authentic and realistic than keyboards, which can sometimes tend to sound tinny and electronic.

Although, keyboards generally come with a larger range of voices, rhythms, and built-in songs, while digital pianos have far less.

So, all in all, digital pianos are preferred more costly and less space effective, but much more resemble a real piano and have a larger range of notes, while keyboards are cheaper and easier to store, but sound faker and have a short range of notes.

The real difference between the two, is that a digital piano has weighted keys to simulate the feel of a real piano, where as the keyboard does not. The voices are more sophisticated as are the programs that run the touch sensitivity.

Digital pianos can be portable, these are known as digital stage pianos and can be excellent for the travelling performer.

All in all a digital piano tries to simulate a real piano experience. A keyboard falls into the synthesiser category. Light keys, little or no touch sensitivity. Generally smaller, more portable and cheaper.