na-adjective
popular; of the common people
Describes something that belongs to, comes from, or is characteristic of the general populace, often with a democratic or grassroots nuance.
彼の政策は民衆的な支持を得ている。
His policies have gained popular support.
この芸術は民衆的な
This art is rooted in the sensibilities of the common people.
庶民的 refers to a down-to-earth, ordinary, or folksy quality, often associated with the lifestyle of commoners, whereas 民衆的 is more about collective popular will or character.
Compound of 民衆 (minshū, 'the common people') + 的 (-teki, adjectival suffix).