Meaning:

“高光” is the literal translation of the English word “highlight,” and “时刻” means “moment.” As the word “highlight” can refer to the most exciting or memorable part of an event or period of time, it’s easy to understand that the Chinese term simply means an “exciting or memorable moment,” like when someone raises his trophy after winning a championship for photographers to take a photo of him.

Example:

A: 你们人生的高光时刻是什么？

Nǐmen rénshēng de gāoguāng shíkè shì shēnme？

What has made a highlighted moment in your life?

B: 毕业前当着全班向暗恋的女生表白。

Bìyè qián dāng zhe quánbān xiàng ànliàn de nǚshēng biǎobái。

Just before graduation, in front of all my classmates, I told a girl whom I had crush on that I liked her.

C: 代表学校参加全国辩论比赛。

Dàibiǎo xuéxiào cānjiā quánguó biànlùn bǐsài。

I represented my school in a national debate competition.