Sha'ir hatsi ne mai kama da alkama ko shinkafa. Hatsin sha'ir yana ƙarewa da tsayi, tsayi mai tsayi kamar gashi, awns. Cikakkun karukan suna kwance a kwance ko sun karkata zuwa ƙasa.
Sha'ir ciyawa ce mai daɗi kamar kowane hatsi. An riga an san shi a zamanin da kuma ya fito daga Gabas. Mutane sun shafe shekaru kusan 15,000 suna cin sha'ir. Sha'ir ya kasance a tsakiyar Turai tun lokacin Neolithic.
A tsakiyar zamanai, an yi amfani da sha'ir sosai a matsayin abincin dabbobi. Ana yin wannan har yanzu tare da sha'ir hunturu. Ya fi zuwa aladu da shanu.
Mutane galibi suna buƙatar sha'ir bazara don yin giya da shi. Shi ya sa ake kuma kiran giya da ruwan sha’ir. Hakanan akwai wasu ƙwarewa, kamar miyan sha'ir Bündner. A da, talakawa da yawa sun dafa sha'ir da ruwa don yin wani ɗanɗano mai suna groats.