It's the third-person singular and plural form of the verb "gustar" (to like), used when the subject is singular (he/she/it) or plural (they).
Examples:
* A ella le gustan los gatos. (She likes cats.)
* A los niños les gustan los caramelos. (The children like candy.)
* A él le gusta el fútbol. (He likes soccer.)
Important Note:
* "Gustar" is an impersonal verb in Spanish, meaning it takes the subject as an indirect object. Therefore, it is conjugated with the third-person singular or plural form, even if the subject is singular.
* You need to use "le" or "les" (depending on whether the subject is singular or plural) before "gustan" to indicate the subject.