笔记 (bǐjì) literally means 'pen record' — 笔 (bǐ) means 'writing brush' or 'pen', and 记 (jì) means 'to record' or 'to note down'. Together, they refer to written notes taken to capture information, ideas, or reminders. This word is commonly used in academic, professional, and personal contexts — for example, students take notes during lectures, professionals jot down meeting points, and individuals keep personal notes in notebooks or digital apps.

Unlike the more formal or technical term 记录 (jìlù, 'record'), 笔记 emphasizes handwritten or deliberately composed summaries rather than raw documentation. It often implies selectivity, interpretation, and personal organization. The word can be used as a countable noun (e.g., 一本笔记, 'a notebook') or uncountable (e.g., 做笔记, 'to take notes'). It’s neutral in register and appropriate in both spoken and written Chinese.