Korean counts things with counter words after the number: 개 for items, 명 for people, 잔 for cups and more.
개
Counter for things, items
명
Counter for people
분
Counter for people (honorific)
마리
Counter for animals
잔
Counter for cups, glasses
병
Counter for bottles
권
Counter for books
장
Counter for flat things (paper, tickets, photos)
대
Counter for vehicles, machines
살
Counter for age (years old)
번
Times (how often)
켤레
Pair (shoes, socks)
벌
Counter for clothes (garments)
송이
Counter for flowers
그릇
Bowl (counter for bowls of food)
인분
Portion (for one person)
층
Floor (with Sino-Korean numbers)
원
Won (with Sino-Korean numbers)
시
O'clock (with native Korean numbers)
사과 두 개
Two apples
학생 다섯 명
Five students
손님 세 분
Three guests (honorific)
강아지 한 마리
One puppy
커피 한 잔
A cup of coffee
맥주 두 병
Two bottles of beer
책 세 권
Three books
표 네 장
Four tickets
차 한 대
One car
양말 두 켤레
Two pairs of socks
셔츠 한 벌
One shirt
장미 열 송이
Ten roses
밥 한 그릇
A bowl of rice
삼 층
The third floor
몇 개 드릴까요?
How many would you like?
몇 명이에요?
How many people?
커피 두 잔 주세요
Two coffees, please
사진 한 장 찍어 주세요
Please take a photo (of us)
고양이가 세 마리 있어요
I have three cats
스무 개
Twenty items (스물 becomes 스무)
한 번 더
One more time