I washed the dishes I had used in the sink.
Dirty dishes are piling up in the sink.
I installed a new sink in the kitchen.
I filled the sink with water and washed the vegetables.
I put the dirty cup in the sink.
シンク usually refers to a kitchen (or utility) sink, while 洗面台 specifically means the bathroom washbasin used for washing your face and hands.
stand; base; platform; table; rack · setting (of a gem); mounting · stock (in grafting) · counter for machines and vehicles · level; mark; range; decade (of one's life) · tall building (with a fine view); observation platform · plateau; heights
Loanword from English 'sink'.