Lois Lane has been through a lot in her 80 years. At times her character ranged from human symbol of the societal expectation placed upon women to man-hungry marriage monster to actual superhero herself, but at her core and at her best, Lois Lane was a journalist and a true match for Superman. She had no powers—not super ones, anyway—but she was a hero, and much of that came from the forgotten women behind her, like Dorothy Woolfolk who ushered in a strong feminist slant on Lois, along with some other major elements of Superman (like kryptonite—maybe you've heard of it).
With 80 years of history, there's a lot of Lane to cover. If you want to go back and do some reading, we've got you there, but if you want the nitty gritty of what makes Lois Lane so much more than "Superman's Girlfriend," this video will help.
From damsel in distress to deep in the trenches risking her own life, Lois Lane has long meant and continues to mean so much to comics, film and the (Daily) planet, and we're lucky to have her.