Yum cha (飲茶), which literally means "drink tea", is the Cantonese tradition of brunch involving Chinese tea and dim sum (點心), which translates literally to "touching heart" and refers to the small portions of steamed, pan-fried, and deep-fried dishes served in bamboo steamers. The dishes are meant to be eaten communally, and people often go to yum cha in large groups for family gatherings and celebrations.
There are over one thousand dim sum dishes in existence today. And the tea is just as important as the food. Many Cantonese restaurants serve dim sum as early as five in the morning, while more traditional restaurants typically serve dim sum until mid-afternoon. Dim sum restaurants have a unique serving method where servers offer dishes to customers from steam-heated carts.
Source: Wikipedia