Final answer:
The Rococo style became fashionable during King Louis XV's reign and is characterized by elaborate ornamentation and light colors. It was prominent from 1730 to 1760 but declined with the rise of Enlightenment and revolutionary ideals favoring Neoclassicism.
Step-by-step explanation:
The Rococo style became popular during the reign of King Louis XV in the 18th century. This artistic movement is known for its ornate and decorative elements, featuring intricate designs, pastel colors, and playful themes. It emerged as a reaction to the formal classicism of the previous era and flourished in France, initially with the support of the aristocracy who had left Versailles for Paris. The period known as Rococo lasted roughly from 1730 to 1760, peaking during Louis XV's reign. Rococo art is exemplified by works like Jean-Honoré Fragonard's The Swing and the opulent room designs of François Cuvilliés the Elder.
However, the onset of the Enlightenment and the French Revolution brought a shift in tastes and ideals, ultimately leading to the decline of Rococo in favor of Neoclassicism and art that promoted morality, simplicity, and the virtues of the common person.