What women want in a man is a very personalized trait; each woman has different things she is looking for, and different things she is attracted to in men, and furthermore, women will want different things in a man at different points of their individual lives. However, there are many tendencies regarding what women want in a man that are worth discussing and can be valuable towards understanding adult relationships and becoming better at them.
The best answers to the question of what women want in a man treat it as a two part problem. Women have both an idea of what they want in a man, and also things in men that attract them when they see him in person. The first aspect of this tends to be more relevant the older that they are (or to be more accurate, the later the stage of life they are in.)
How to attract women is a question that has been extremely well-documented. Women are attracted above all else to confidence, a complete absence of desperation, those who make them feel special, and a semblance of a style and look that is attractive to them. This means that, while of course it helps to be very attractive, tall, handsome, muscular, etc, it is far from necessary, and if you’re good enough with women you can overcome great deficiencies in those areas.
Some tricks to appearing confident are to maintain eye contact throughout conversation, to order drinks and speak to others around her with authority and poise, and to refrain from pressing them or trying too hard. Make her feel special by noticing very specific details about her, and remembering things she says, then talking about them. Finally, make sure you put at least a small bit of effort into your appearance. Don’t look like a slob. If you follow this advice, you will satisfy at least one important requirement of what women want in a man. While not sufficient in many cases, this is necessary for making her want you.
The second characteristic women want in a man is a more difficult one. Women at different stages of their lives value very different things. The younger girls value where you go to school, what interests you have, what level of status you have, etc, more than older ones, who care more about your personality, how well you treat them, your job, your plan for the future, etc. Women who want kids will look for qualities they believe make good fathers, such as emotional maturity, a good sense of humor, a steady source of income, etc.
All in all, women of all ages tend to like men with great senses of humor and confidence in themselves. At all ages these men are attractive and tend to be the ones with the greatest chance of success in making relationships last a long time (if they want to.) While women do fall for assholes too often, that is not what they truly want in a man and, therefore, relationships with them do not usually last as long (or are not as healthy.)