What does a congratulatory gift mean?

Congratulations means gifts given during congratulations.

Related words:

A greeting is a polite term used by the host to express to guests that there is no need to spend money on gifts.

Source and detailed explanation:

Cao Xueqin's "Dream of Red Mansions". Chapter 45: I don't have any gifts, and I don't know how to reward them. Don't make fun of me after eating and leaving.

Wei Wei's "Collection of Zhuang Xing·Walking Ahead of Time": "Finally, I copied a small poem I wrote at the back as a small gift to you."

Chapter 36 of Wu Jingzi's "The Scholars": "After a few days, I recovered from my illness. I went to Beijing to fill in the personal confession and came back. My relatives, friends, and employers all sent some congratulatory gifts."

Volume 12 of "The Surprise at the First Moment": "Ruan Taishi also sent a congratulatory gift, and he came to the door to say happy."