As you play, you can earn emblems by fulfilling certain conditions.
Each emblem has an “emblem effect”, which provides various bonuses simply by having earned the emblem.
Emblems also vary in rarity, and the higher the rarity, the greater the effect.
*If you have multiple emblems of the same type but different rarity, only the effect from the highest rarity emblem will be applied.
You can check all the obtainable emblems and how to earn them by tapping the "Emblems" button on the Home Screen.