Since the 1990s, Catwoman has been featured in an eponymous series that cast her as an antihero classy cat burglar rather than a villain. The character has been one of Batman's most enduring love interests.
“I felt that women were feline creatures and men were more like dogs. While dogs are faithful and friendly, cats are cool, detached, and unreliable. I felt much warmer with dogs around me—cats are as hard to understand as women are. Men feel more sure of themselves with a male friend than a woman. You always need to keep women at arm's length. We don't want anyone taking over our souls, and women have a habit of doing that. So there's a love-resentment thing with women. I guess women will feel that I'm being chauvinistic to speak this way, but I do feel that I've had better relationships with male friends than women. With women, once the romance is over, somehow they never remain my friends."
The latest Batman movie does not really explore Selina's backstory only hinting at her time spent in prison and the fact that her housemate is a prostitute who hussles men but there are many different versions of Selina Kyle's origin.
In Batman #62 (December/January 1950) it is revealed that Catwoman is an amnesiac flight attendant who had turned to crime after suffering a prior blow to the head during a plane crash she survived. She reveals this after being hit on the head by a piece of rubble while saving Batman while he was chasing her. Although, in issue 197 of The Brave and the Bold, she admits that she made up the amnesia story because she wanted a way out of the past life of crime.
The Brave and the Bold #197 (April 1983) elaborates upon the Golden Age origin of Catwoman given in Batman #62, after Selina reveals that she never actually had amnesia. It is revealed that Selina Kyle had been in an abusive marriage, and eventually decides to leave her husband. However, her husband keeps her jewelry in his private vault, and she has to break into it to retrieve it. Selina enjoys this experience so much she decides to become a professional costumed cat burglar, and thus begins a career that repeatedly leads to her encountering Batman.
Catwoman's origin—and, to an extent, her character—was revised in 1987 when writer Frank Miller and artist David Mazzucchelli published Batman: Year One, a revision of Batman's origin. She works as a prostitute in order to survive and wants to break away from her abusive pimp (and former boyfriend). She witnesses his crimes and, because of an event that occurs to her sister, fears for her sister's life and begins to study self-defense and martial arts. Her teacher inspires Selina to become more than what she has been and she realizes that prostitution is no life for her, or for Holly.
Holly Robinson is a young runaway who idolizes Selina, but is much too young to be on the streets as far as Selina is concerned. Selina shares her home with Holly after she takes her in. As the story progresses Selina is led to a bit of burglary, she dons a catsuit costume that her now former pimp gave to her the day that she told him she was out of the business. After costuming herself so as not to be revealed, she gets a taste for burglary and begins to do it in more of a Robin Hood way than an actual thief. This is, however, how she runs into Batman. After a small confrontation, she begins to be inspired to stay in her costume and become the "Catwoman" after seeing Batman in action with others. Selina gets the idea that, if there is a "bat", why can there not be a "cat"?
The 1989 Catwoman limited series, written by Mindy Newell and with art by J.J. Birch, expanded upon Miller's Year One origin. This storyline, known as "Her Sister's Keeper", explores Selina's early life as a prostitute and the start of her career as Catwoman. The story culminates with Selina's former pimp, Stan, abducting and violently abusing her sister Maggie, who, in contrast to Selina, is a nun. Selina kills Stan to save her sister, and gets away with it. Most of this is revealed in the former series, but is expanded upon in "Her Sister's Keeper".
Catwoman (vol. 2) #69, which provides details about Selina's childhood, neglects Maggie's existence. Maria Kyle is a distant parent who preferred to spend her time with cats, and commits suicide when Selina is very young. Her alcoholic father, Brian, is cold to Selina for resembling her mother (whom he resents for dying), and eventually drinks himself to death. To survive, Selina takes to the streets for a time before getting caught and sent first to an orphanage, then juvenile hall, "where Selina began to see how hard the world could really be." Maggie's fate at this point in the time-line is not alluded to. However, when Ed Brubaker reintroduces her into the comic, he implies that Maggie may have directly entered an orphanage and promptly been adopted.
When she is 13, Selina discovers that the hall's administrator has been embezzling funds, and she confronts her. In an attempt to cover up her crime, the administrator puts Selina in a bag and drops her in a river to drown (like a cat). She escapes and returns to the orphanage, where she steals documents exposing the administrator's corruption. She uses these to blackmail the administrator into erasing "Selina Kyle" from the city's records, then steals the administrator's diamond necklace and escapes the orphanage. Selina eventually finds herself in "Alleytown - a network of cobblestone streets that form a small borough between the East End and Old Gotham." Selina is taken in by Mama Fortuna, the elderly leader of a gang of young thieves, and is taught how to steal. Fortuna treats her students like slaves, keeping their earnings for herself. Selina eventually runs away, accompanied by her friend Sylvia. However, the two have difficulty surviving on their own, and in desperation try to support themselves by working as prostitutes. The two drift apart afterward, with Sylvia coming to resent Selina for not inquiring about what had happened to her at the hands of her abusive first client.
In the Catwoman: Year One story,Selina (now an adult) achieves some success as a thief. Following a disastrous burglary, however, she accepts an offer to "lie low" as a dominatrix in the employ of a pimp named Stan. They plan to trick men into divulging information that might be used in future crimes. According to this storyline, Selina trains under the Armless Master of Gotham City, receiving education in martial arts and culture. During this time, a client gives her a cat o' nine tails, which Selina kept as a trophy.
Batman: Dark Victory, the sequel to The Long Halloween, implies that Catwoman suspects she is the illegitimate daughter of mafia boss Carmine Falcone, although she finds no definitive proof. Selina's connection to the Falcone family is further explored in the miniseries Catwoman: When in Rome. Though the story adds more circumstantial evidence to the theory of Selina's Falcone heritage, establishing that the Falcones' secondborn daughter was put up for adoption in America, it also supplies no definitive proof.