You are not alone; most people not coming from the field ask what Interaction Design is, although it is all around us, we interact all the time.
Interaction Design creates a dialogue between a person and a product, service or system. Within that dialogue, the overall experience of your "something" benefits. I'm not designing for you or your users. I'm creating with you and foremost with your user!
As an Interaction Designer, I focus on process-oriented working with methodologies from the field. Most design fields focus on stage 3 and jump directly into the fifth stage. Interaction Design ensures that the intent of your product or service is clearly communicated to the user so that they have what they need to complete their objective efficiently, easily and just have a wholesome experience.
As you now got some insight into the broadness of Interaction Design, you will understand the variety of the selected project on my portfolio.