upsarg ka prayog batayen

 Upsarg is pre - fix in english 

for example :

ap+maan= apmaan
sam+maan= sammaan
nav+sakshar= navsakshar
san+geet= sangeet
san+yog= sanyog
ku+pratha= kupratha
su+pratha= supratha
dur+vyavahar= durvyavahar
su+raksha= suraksha
baal+vihar= baalvihar