Catwoman was the creation of Bob Kane and debuted in Batman #1 (Spring, 1940) as a yet-uncostumed, exotically beautiful dark-haired woman known only as "The Cat."
Catwoman's name was revealed as Selina Kyle in 1950, in "The Secret Life of Catwoman" also by Bob Kane
Julie Newmar created the definitive Catwoman of the 1966 TV series
First movie appearance was Lee Meriwether.
In December 1977, Selina Kyle/Catwoman was revealed as the woman Golden Age Batman ultimately married in a "Secret Origin" of a new heroine called The Huntress (Secret Origins of Superheroes #17), How they came together was told in an April 1983 tale "The Autobiography of Bruce Wayne" (Brave and the Bold #197) while the wedding itself was shown in 1981's Superman Family #211.
“Pre-Crisis” Bruce Wayne and Selina Kyle began dating in February 1979 (Batman 308), elevating her to a regular character in the Batman titles for about a year in her uncostumed persona, prior to Catwoman being given a solo run as a backup in the Batman comic, a precursor to the later solo comic (see below).
1992 saw a definitive Hollywood movie appearance:  Michelle Pfeifer in Batman Returns
Adrienne Barbeau voiced Catwoman on Batman the Animated Series, debuting (with a Catwoman double episode entitled "The Cat and the Claw") on Fox in September, 1992
Launch of Catwoman as a solo comic book in August 1993.  The Jim Balent design was selected the Sexiest Character in Comics at the time, and continues to be recognized as the classic look (see below).  
Chris Dee pens the definitive Catwoman Origin in Cat-Tales #33 Cattitude.

The “Post-Crisis” Bruce Wayne and Selina Kyle began dating in The Long Halloween by Jeph Loeb.  Loeb would later pen the pivotal development in the Batman/Catwoman relationship when Batman reveals identity in HUSH (Batman 615, July 2003).
A&E featured Catwoman on "Biography" prior to release of Halle Barry movie, July 2004
Anime artist Kia Asamiya created design for an action figure produced by Yamoto Toys based on the classic Balent look/incarnation.  Image sold out in numerous comic shops.  Wizard's ToyFare Magazine again recognized this version as the sexiest Batman-related figurine (April 2005).
Ultimate Super Heroes, Ultimate Super Villains, Ultimate Super Vixens (May 2005)
Bravo TV's three-part special celebrating the heroes, villains and vixens who have created powerful impressions on fans names Catwoman the #1 Vixen
Metropolitan Museum of Art SUPERHEROES: FASHION AND FANTASY exhibit at its Fashion Institute (May 2008) features Catwoman as the Paradoxical Body, featuring the iconic Jim Balent costume and Catwoman #1 cover for the website.

"We love Catwoman! She is sexy, feminine. We love the way she moves," say Domenico Dolce and Stefano Gabbana, who created a molded corset, leg and arm pieces, and a Swarovski-crystal-studded mask for the Met exhibit.

Vogue cover (Spring 2008)
Vogue follows Metropolitan Fashion Institute's lead in running a story on the costumes of comic book character and commissions major designers to create fashion inspired by favorite figures.  Dolce and Gabbana instantly choose Catwoman, whose piece is featured on the cover for the story, picturing the Dolce and Gabbana corset and studded mask with Christian Louboutin for Rodarte spiked heels.

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