The baroque style dominated European art in the seventeenth century.
To an art historian, it connotes vigorous movement, emotional intensity, and a sense of balance (not art that is excessive and florid, the popular meaning of the word baroque).
The rococo style flourished in the eighteenth century, after the baroque period; it is characterized by lightness, grace, and playfulness.
The word rococo was coined by merging the Italian barocco (baroque) and the French rocaille (originally a term for fancy rock- and shellwork).