值得 (zhídé) means 'to be worth' — it evaluates whether the effort, cost, or time for something is justified. It is broader than 值 (zhí), which is more colloquial and often used alone (e.g., 值吗？), and different from 配 (pèi) 'to deserve', which focuses on merit or suitability, not cost-benefit. 值得 is the standard word for 'worth doing' in most contexts.