Once upon a time, entrepreneurs were reluctant to advertise online. In the early days of the internet you advertised in daily newspapers, magazines and other analogue media as standard, and the step to online marketing was a big one. The tide has now turned and online is the standard. Many entrepreneurs have only online, digital assets in their marketing mix, ignoring offline assets. Outdoor advertising is such a means that by no means every entrepreneur is considering. That is a shame, because out of home (OOH), as outdoor advertising is called in professional jargon, can still be very effective and therefore valuable for many companies.
Here you can read more about image and branding. Image includes the image that people have about the company in the market, and that can therefore be different than the company actually is. That is the identity. With branding you come to the desired image, which is typically much more positive than the current identity or image. Branding is primarily brand and product oriented. Image is more business-oriented, just like having the image of being a 'green' bank.