‘即兴’ (jí xìng) describes something created or performed spontaneously, without prior preparation—like an impromptu speech, an improvised musical solo, or a spur-of-the-moment decision. The first character 即 means 'immediately' or 'right at that moment', while 兴 means 'interest', 'excitement', or 'enthusiasm'; together they convey the idea of acting on immediate inspiration or emotional impulse.

This term is commonly used in artistic, social, and everyday contexts: musicians may give a 即兴演奏 (impromptu performance), teachers might ask students for 即兴发言 (an off-the-cuff comment), and friends could decide on a 即兴旅行 (spontaneous trip). It carries a positive, lively connotation—suggesting creativity, flexibility, and authenticity—but is not used for unplanned negative events (e.g., accidents or emergencies).