A fetish is a particularly strong fixation or obsession with something or someone, often sexual, but not necessarily about intercourse. Some people have fetishes about the strangest things, anything you can imagine from balloons to feet.
Sexual fetishism, or erotic fetishism, is the sexual arousal a person receives from a physical object, or from a specific situation. The object or situation of interest is called the fetish, the person a fetishist who has a fetish for that object/situation. Sexual fetishism may be regarded, e.g. in psychiatric medicine, as a disorder of sexual preference or as an enhancing element to a relationship causing a better sexual bond between the partners. Many people embrace their fetish rather than attempting treatment to rid themselves of it.
Some of the ultimate fetishes are foot fetish, breast fetish, leather fetish and fetish slave bondage. Then you have some of the more weird fetishes like fur fetish, latex fetish and adult diaper fetish.
There are people that live the lifestyle of Extreme Fetish. Every waking hour, they are existing in the world of bondage and discipline or B&D. Extreme bondage fetish may consist of being tied and gagged to a chair or in a closet for minutes, hours or even days. The exteme fetishist revels in this type of fetish play. The foot fetish extreme could include trampling, high heals, toe sucking and foot worship. Every person that has a foot fetish has their own particular brand of kink.
BDSM or bondage and discipline, B&D, sadomasochism and s&m utilizes corporal punishment using whips and chains, handcuffs and manacles as well as riding crops, bull whips and paddles. The "Top" or "Master" administers punishment and domination in a sadistic manner to the "bottom", "slave" or masochist. A true Sadist knows just how far to push his partner to fullfill their own masochistic tendancies. There are also many forms of extreme fetish sex. Having your partner in extreme bondage as they beg for mercy is an extreme turn-on for some people. It's not sick and twisted sex, merely fetish sex.
Webster's defines fetish as 1. an object regarded as having magical power; talisman... nope. 2. something eliciting unquestioning reverence or devotion... getting closer. 3. an object used for achieving sexual excitement or fulfillment... ah, there we go! - fetishism, n. - fetishist, n. - fetishistic, adj.
A raw definition of a fetish is something that turns you on. For example, wearing leather or fishnets turns you on. A fetish could also mean that you have a very strong liking for something, such as feet or hair. It's kind of like saying, "I really, really, really, really love this... [insert name of object or thing here]."
A fetish could also be classed as an obsession. And, there are numerous fetishes, such as having a sexual fetish or a choking fetish.
Speaking of sexual fetish... Sexual fetishism, or erotic fetishism, is the sexual arousal a person receives from a physical object, or from a specific situation. The object or situation of interest is called the fetish, the person a fetishist who has a fetish for that object/situation.  Sexual fetishism may be regarded, e.g. in psychiatric medicine, as a disorder of sexual preference or as an enhancing element to a relationship causing a better sexual bond between the partners.  Arousal from a particular body part is classified as partialism.