The term 'Nick Jr. Explorer' refers to the popular animated television series 'Dora the Explorer, ' which first aired on Nickelodeon's Nick Jr. channel in 2000. The show follows the adventures of a young Latina girl named Dora, who embarks on quests with her monkey friend Boots to help her overcome obstacles and reach her destination. The show has been praised for its educational content and positive messages about friendship, problem-solving, and perseverance.