In readiness, in preparation for future use, as in I'm keeping several videos in store for your visit. Edmund Spenser used this idiom in The Faerie Queene (1590): "Then for her son . . . In her own hand the crown she kept in store." [1300s]
in store for. Forthcoming for, awaiting, as in There's trouble in store for you. [Mid-1600s]
Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.