Flipkart introduces ROI+, which provides more benefits than usual return on investment from advertising campaigns. ROI+ gives monetary return as well as new customers and increased product visibility. The advertising tab on Flipkart allows customizing the view of ROI charts and campaign data. It displays metrics like page views, orders, and indicators for ROI, ad views, unique views, and new customers gained. The graph adapts to scenarios like new sellers with limited data or paused campaigns.