In 2014 users are spending more and more time on mobile devices such as iPhones and iPads. Recent research has shown 86.5% of an average user's time is spent focused on applications meaning only up to 13.5% of a user's time is spent in the browser and this figure is dropping.
So your website should be mobile compatible for usability but most users these days expect to be able to find a business's companion app and will search for your presence on the App Store.
Creating a mobile app for your business can have serious advantages. If a user can access and interact with your data, buy your products and procure your services easily 'on the go' this can drive sales, customer loyalty and give your business huge advantages over your competitiors.