通知 (tōngzhī) is used for notifications that may not be as formal as 通告 (tōnggào), while 公告 (gōnggào) specifically refers to public announcements often made in a more official capacity.

Think of 通 as a '通道' (tōngdào) or passage that '通' (connects) people with news. The character 告, which means to 'declare' or 'inform,' can remind you of a 'gavel' announcing something important. Together, they form the idea of a public announcement.

通告 is often used in formal contexts, so be cautious when using it in informal conversations. A common mistake is to confuse it with 通知 (tōngzhī), which is more casual. Remember to use the correct tone when pronouncing; the fourth tone in 告 is important to convey the right meaning.

通告 is not specifically part of the HSK vocabulary, but it is essential for learners aiming to understand formal communication in Chinese. Focus on its usage in conjunction with other formal terms like 通知 (notice) and 公告 (public announcement) to broaden your vocabulary.

In Chinese culture, public announcements often play a crucial role in community engagement, especially in educational institutions and governmental activities. For instance, schools frequently use 通告 to inform students and parents about events or changes.

Learners often confuse 通告 with the similar sounding 通知, using them interchangeably. For example, saying '我发了一个通告给朋友' (I sent an announcement to my friend) is incorrect; it should be '我发了一个通知给朋友' (I sent a notice to my friend).