PRE-CRISIS ON INFINITE EARTHS
One of the first heroines in comic books, Lois had no shortage of stories in the Golden and Silver Ages of comics. From the 1930s to the 1960s, Lois existed as a career-minded reporter who was the on-again-off-again girlfriend of Superman and occasional professional rival of mild-mannered Clark Kent. In these stories, Lois was, more often than not, thrust into some sort of danger so the Superman could save her.
Alternate versions of Lois and Clark were created in the early 1960s. They lived on Earth-Two, along with the rest of the Golden Age Super Heroes. There, the two were officially married. Back on Earth-Prime, however, Lois continued to oscillate between wanting to be with Superman and wanting nothing to do with him. Occasionally, she and Clark were married in various "imaginary stories," but each time the marriage was revealed to be a trick or a dream and otherwise annulled.
In 1958, Lois proved popular enough to earn her own solo ongoing title, SUPERMAN's GIRL FRIEND, which emphasized the love triangle between Clark, Lois, and Superman.
Post-CRISIS ON INFINITE EARTHS
The Modern Age Lois Lane was introduced in 1986’s THE MAN OF STEEL limited series, a retelling of Superman's origin story. Departing from her Silver Age portrayal, Lois became a tough-as-nails reporter who very rarely needed help, much less for a super hero to swoop in and save her.
During this time, Clark and Lois’s relationship evolved, and Clark eventually proposed marriage after revealing his secret identity to her (in 1991’s ACTION COMICS #662). But before they could wed, Superman was killed by the alien monster Doomsday (in 1993’s “The Death of Superman” storyline).
Three years later, following Clark's resurrection, the two were finally, officially married in 1996's SUPERMAN: THE WEDDING ALBUM.
Lois and Clark pursued a life together, even adopting a Kryptonian son they named Chris Kent, who was revealed to be the son of General Zod. Despite his ancestry, Chris inspired Lois' maternal side, and she was devastated when he eventually sacrificed himself to seal the Phantom Zone and save Earth from Zod and his followers.
The New 52
Following the events of 2011’s FLASHPOINT, much of DC history was reimagined, including Lois and her relationship with Clark. No longer married or romantically involved, Lois became one of Clark's staunchest allies and civilian friends. She retained her job as a reporter for the Daily Planet, but lost all prior knowledge that Clark Kent was in fact Superman.
Following an attack on Earth by Brainiac, Lois was given psychic abilities that allowed her to fight alongside Superman to stop the invasion. Unfortunately, the use of these powers caused her to lapse into a coma almost immediately after the battle was won. When she awoke, she was powerless and had no memory of anything she learned as a psychic (SUPERMAN #27, 2014).
Later, during the cosmic events of 2015’s CONVERGENCE, a version of Lois more reminiscent of the pre-FLASHPOINT continuity was introduced. This version of Lois was still married to Clark. The two welcomed a baby boy, Jon Kent, into the world during the crisis.
Following 2016’s DC UNIVERSE: REBIRTH #1, the version of Lois seen in CONVERGENCE was left in the prime DC universe where she, along with Clark and their son, lived in secret using the surname "White,” while the other Clark and Lois lived their lives in Metropolis.
This scenario, however, was torn apart following the "death" of the acting Superman and subsequent temporary empowerment of that version of Lois (SUPERWOMAN #1, 2016). Lois Lane briefly became Superwoman while Lois White wrote in secret under the pseudonym “Author X.” When Lois Lane's Superwoman powers finally overwhelmed and killed her, Lois and Clark White stepped out of the shadows and into the public eye once more.
Later, during 2017’s “Superman Reborn” story arc, a scheme by Superman’s old enemy Mr. Mxyzptlk resulted in a new collision of universes, causing the histories of both the Lane family of the New 52 and the White family of CONVERGENCE to merge into one solid timeline. This resulted in Lois returning to her job as a reporter at the Daily Planet.