What is the difference in the movement of the demand curve and the change or shift of demand curve?

Question

What is the difference in the movement of the demand curve and the change or shift of demand curve?

Answer 1

When there is a movement alond a demand curve we are only concerned with a "change in price". We are not worried about any other factors that might change the demand curve.  Humans change their demand for a product because they either feel richer or poorer when the price of a good changes or the buy more of a substitute.

The demand curve shifts when other factors are considered. These factors are:

Change of income

Price of compliments

Price of substitutes

Tastes and Trends

Population

Expectations