halo effect
noun[S]
ukusthepositiveopinionthat someone has of aperson,product,company, etc. as awhole, which isbasedon anearlieropinionof oneparticularqualityorfeature:
Theaimis tocapitaliseon thehaloeffectofcoreproducts, by whichconsumersarewillingtotrysomething new if it isofferedunder abrandthey already like.