Tra (hay che) la đo uong pho bien thu hai tren the gioi (sau nuoc uong). No lam bang cach ngam la, choi, hay canh cua cay tra (Camellia sinensis) vao nuoc soi tu vai phut đen vai gio. La tra co the đuoc oxy hoa (u đe len men), say rang, phoi, hay pha them cac loai thao moc khac nhu hoa, gia vi, hay trai cay khac truoc khi che vao nuoc soi. Trong pham vi thuc uong che tu Camellia sinensis thi co bon loai tra that: Tra đen, Tra O Long, Tra xanh va Tra trang. Nuoc tra la nguon caffein, theophylline va chat chong oxy hoa (antioxidant) tu nhien va gan nhu khong co mo, carbohydrate, hay protein. Nuoc tra co mui thom, vi hoi đang va chat.


Trong va thu hoach Camellia sinensis la loai thuc vat thuong xanh moc chu yeu trong cac vung khi hau nhiet đoi va can nhiet đoi. Nhieu giong cung co the thich nghi voi khi hau bien va đuoc trong đen tan phia bac nhu Pembrokeshire o Đao Anh luc đia va Washington o Hoa Ky.

Cay tra đuoc nhan giong tu hat va cat; no mat khoang 4 đen 12 nam đe cay ra hat giong, va khoang 3 nam truoc khi mot cay moi san sang cho thu hoach. Ngoai khu 8 hay vung khi hau am hon, cay tra can it nhat 1270 mm luong mua moi nam va moi truong đat chua. Nhieu cay tra chat luong cao đuoc trong o nhung đo cao len đen 1.500 m (4.900 ft) so voi muc nuoc bien. O đo cao nay, cay phat trien cham hon, chung cho ra mui vi đac biet hon.
Tuy vao tinh trang thu hai phan bup ma nguoi ta co the lam ra cac loai tra voi mui vi khac nhau nhu tra bup (1 tom 2 la), tra tom non (1 tom 1 la), tra loc đinh (non che nguyen chat) va tra đinh ngoc (choi non tinh khiet)
Hai giong thuong đuoc trong la Camellia sinensis var. sinensis, đuoc dung lam tra o Trung Quoc, Đai Loan va Nhat Ban, va giong Camellia sinensis var. assamica, đuoc dung trong Pu-erh va tra An Đo (khong phai Darjeeling). Trong cac giong thuc vat nay, co nhieu chung va giong vo tinh hien đai. Kich thuoc la la tieu chuan chinh trong viec phan loai cay tra, voi 3 cach phan loai co ban la, Assam, đac trung boi la lon nhat; tra Trung Quoc, đac trung boi la nho nhat; tra Campuchia, đac trung boi la co kich thuoc trung binh.
Cay che lon cao đen 16 m (52 ft) neu khong bi tac đong, nhung cac loai cay trong thuong đuoc tia canh đe đo cao cua chung ngang voi thac lung nham đe tuot (thu hoach). Do vay, khi tia thuong xuyen va than thap thi co nhieu choi non va lam tang chat luong tra. Chi co 1-2 in phan la tren cung cua cay đuoc chon đe hai. Mot cay truong thanh cho la trong vong 7 đen 15 ngay trong mua phat trien.


San xuat Nam 2003, san luong la tra tren the gioi hang nam la 3,21 trieu tan. Đen nam 2010, san luong tra cua the gioi vuot muc 4,52 trieu tan. Nuoc san xuat lon nhat la Trung Quoc, An Đo, Kenya, Sri Lanka, va Tho Nhi Ky.
Bang duoi đay the hien san luong la tra (tan) xep theo cac nuoc san xuat nhieu nhat. Du lieu theo FAO cua Lien Hop Quoc đen thang 2 nam 2012.


Xem them Tra (thuc vat)
Tra sen
Chifir, tra đam đac cua Nga
Frederick John Horniman
Nam thuy sam, thuc uong đuoc san xuat tu vi khuan va nam men đuoc trong tren tra
Tea classics, cac chuyen khao co anh huong lich su cua tra Đong A
Ngay Che Quoc te


Chu thich Đoc them (tieng Viet)

"Chen tra trong suong som", trich tap truyen "Vang bong mot thoi" cua Nguyen Tuan
Cach uong tra trich tap truyen Vu trung tuy but cua Pham Đinh Ho
Jana Arcimovicova, Pavel Valicek (1998): Vune caje, Start Benesov. ISBN 80-902005-9-1 (in Czech)
(tieng Anh)

Claud Bald: Indian Tea. A Textbook on the Culture and Manufacture of Tea. Fifth Edition. Thoroughly Revised and Partly Rewritten by C.J. Harrison. Thacker, Spink & Co., Calcutta 1940 (first edition, 1933).
Kit Chow, Ione Kramer (1990): All the Tea in China, China Books & Periodicals Inc. ISBN 0-8351-2194-1 References are to Czech translation by Michal Synek (1998): Vsechny caje Ciny, DharmaGaia Praha. ISBN 80-85905-48-5
Cook, Eleanor. A Reader's Guide to Wallace Stevens. 2007: Princeton University Press.
John C. Evans (1992): Tea in China: The History of China's National Drink, Greenwood Press. ISBN 0-313-28049-5
Harler, C.R.: The Culture and Marketing of Tea. Second edition. Oxford University Press, New York and Bombay, Reprinted 1958 (First edition 1933, second edition 1956).
Eelco Hesse (1982), Tea: The eyelids of Bodhidharma, Prism Press.
Hobhouse, Henry (2005). "Seeds of Change: Six Plants that Transformed Mankind". Shoemaker & Hoard. ISBN 1-59376-049-3. {{Chu thich tap chi}}: Chu thich magazine can |magazine= (tro giup)
Lu Yu (陆羽): Cha Jing (茶经) (The classical book on tea). References are to Czech translation of modern-day edition (1987) by Olga Lomova (translator): Kniha o caji. Spolek milcu caje, Praha, 2002. (in Czech)
Roy Moxham (2003), Tea: Addiction, Exploitation, and Empire
Nye, Gideon (1850). Tea: and the tea trade Parts first and second. New York: Printed by G.W. Wood.
Jane Pettigrew (2002), A Social History of Tea
Stephan Reimertz (1998): Vom Genuß des Tees: Eine heitere Reise durch alte Landschaften, ehrwurdige Traditionen und moderne Verhaltnisse, inklusive einer kleinen Teeschule (In German)
Yamamoto, T; Kim, M; Juneja, L R (1997). "Chemistry and Applications of Green Tea". CRC Press. {{Chu thich tap chi}}: Chu thich magazine can |magazine= (tro giup).
James Norwood Pratt (2005), Tea Dictionary
Kiple, Kenneth F.; Ornelas, Kriemhild Conee, bien tap (2000). The Cambridge World History of Food. Quyen 1. Cambridge: Cambridge University Press. ISBN 0521402166..
Mondal, T.K. (2007). "Tea". Trong Pua, E.C.; Davey, M.R. (bien tap). Biotechnology in Agriculture and Forestry. Quyen 60: Transgenic Crops V. Berlin: Springer. tr. 519–535. ISBN 3540491600..
Sanyal, Amitava (ngay 13 thang 4 nam 2008). "How India came to be the largest tea drinking nation". Hindustan Times. New Delhi. tr. 12. .
Karmakar, Rahul (ngay 13 thang 4 nam 2008). "The Singpho: The cup that jeers". Hindustan Times. New Delhi. tr. 12. Ban goc luu tru ngay 26 thang 8 nam 2013. Truy cap ngay 7 thang 5 nam 2011..
Lester Packer, Choon Nam Ong, Barry Halliwell (2004): Herbal and Traditional Medicine: Molecular Aspects of Health, CRC Press, ISBN 0-8247-5436-0
Nutrition, CS (1999). "Tea and Health". Nutrition (Burbank, Los Angeles County, Calif.). Quyen 15 so 11–12. tr. 946–949. PMID 10575676. {{Chu thich tap chi}}: Lien ket ngoai trong |title= (tro giup)
Journal of Epidemiology and Community Health, M; Tunstall-Pedoe, H (1999). "Coffee and tea consumption in the Scottish Heart Health Study follow up: conflicting relations with coronary risk factors, coronary disease, and all cause mortality". Journal of epidemiology and community health. Quyen 53 so 8. tr. 481–487. doi:10.1136/jech.53.8.481. ISSN 0143-005X. PMC 1756940. PMID 10562866. {{Chu thich tap chi}}: Lien ket ngoai trong |title= (tro giup)


Lien ket ngoai Tra tren DMOZ

Tea tren chuong trinh In Our Time cua BBC. (Nghe tai đay)
Hiep hoi tra Viet Nam
Hiep hoi Tra Tan Cuong Thai Nguyen
Hiep hoi tra xanh the gioi
Le hoi van hoa tra tai Lam Đong Luu tru ngay 4 thang 3 nam 2016 tai Wayback Machine
Trong che huu co, huong đi moi o Cao Bo Luu tru ngay 3 thang 7 nam 2014 tai Wayback Machine