Instacart is an on-demand grocery delivery platform that facilitates doorstep delivery of groceries in major US cities. In its early days, Instacart was funded through investments from Kleiner Perkins Caufield & Byers, Andreessen Horowitz, and others. It achieved product-market fit by addressing users who could order groceries online for delivery, shoppers who picked and delivered the orders, and stores who partnered with Instacart. While facing challenges like shopper retention and reducing delivery times, Instacart was able to grow and now has partnerships with major grocery chains.