讲解 means 'to explain' — a formal, clear, and often step-by-step verbal presentation of information. It combines 讲 (jiǎng), meaning 'to speak' or 'to lecture', and 解 (jiě), meaning 'to untie' or 'to resolve', together evoking the idea of 'untying complexity through speech'. Unlike casual explanations (e.g., 说清楚), 讲解 implies structured, pedagogical communication — commonly used in teaching, technical demonstrations, museum tours, or software tutorials.

This word functions as a transitive verb and typically takes a direct object (e.g., 讲解规则, 讲解过程). It can also serve as a noun meaning 'an explanation' or 'a lecture', especially in contexts like 教学讲解 (teaching explanation) or 视频讲解 (video explanation). While it sounds neutral and professional, it is rarely used in informal chats among friends — there, 说明 or 说说 would be more natural.