Emojis are one of the joys of texting and instant messaging, and iOS integrates them right into the keyboard for your convenience. A feature embedded within the Emoji selector keeps track of the Emojis you use the most often and puts them in a category called “Frequently Used.”
Since you might prefer to manually designate your favorite Emojis for this section, a jailbreak tweak called FavoriteEmojis was recently released for this purpose, but a new competing tweak called Selectmoji by iOS developer Cole Cabral is now available that is said to address some of the shortcomings of the former tweak.