Every business has its own EA. Some of them look like the aftermath of a hurricane, some of them look like a perfectly planned out new housing development.
EA is both an art and a science - it is the discipline of designing, and evolving, both the methodology and the actual IT infrastructure to ensure you have control of your assets, while being equipped to respond effectively to challenges and complexities.
It's so much more than 'just keeping the lights on' and requires a strategic bridge between IT and the business. The benefits of which are far-reaching and impactful to business success.