要求 (yāoqiú) is a neutral, versatile word for 'to request/require' or 'a requirement' — it can be used in both formal and everyday contexts. Unlike 请 (qǐng), which is a polite, social request (like 'please' or 'invite'), 要求 implies a stronger expectation or demand. As a noun, it overlaps with 条件 (tiáojiàn 'condition, prerequisite'), but 要求 focuses on what someone wants or needs, while 条件 is a condition that must be met.