诉求 (sù qiú) is a formal word used for a demand, petition, or appeal, especially concerning rights or interests in legal, consumer, or public contexts. It is stronger and more specific than 要求 (yāo qiú) “request, demand” and more formal than 请求 (qǐng qiú) “to ask for”; unlike 呼吁 (hū yù) “to call on (broadly)”, 诉求 points to a concrete claim. It is commonly seen in phrases like 情感诉求 (emotional appeal) or 法律诉求 (legal claim).