What exactly is the role of a Front-end developer?

What exactly does it mean to be a 'front-end developer'? From company to company? From website to website? Really, from day to day? Does your colleague actually do the same job as you? For example, some days I’m working in InDesign or Photoshop all day, the next I’m writing jQuery or building theme components. The very next day I am writing a blog post, prepping for a presentation, or doing research on the latest trends.