Classical Chinese is still part of the high school curriculum, and is thus intelligible to some degree to many Chinese.

Classical Chinese was used as the main writing system.

Classical Chinese is a written language and is very different from spoken Chinese.

Classical Chinese has more pronouns compared to the modern vernacular.

In syntax, Classical Chinese is always ready to drop subjects, verbs, objects, etc. when their meaning is understood (pragmatically inferable).

Classical Chinese has had influence of Jingtang Jiaoyu.

Today, pure Classical Chinese is occasionally used in formal or ceremonial occasions.

Classical Chinese is taught primarily by presenting a classical Chinese work and including a vernacular gloss that explains the meaning of phrases.

Also reproduced in full, in Classical Chinese:

These writers in Classical Chinese were trained by memorizing extensive tracts in the classics and histories.