You were sent to this site because someone determined you can't spell.
The correct spelling of "u" is "you". Get it right.
Definition Courtesy of Merriam-Webster
(Read it because you apparently failed grammar class.)
ˈyü, yə also yē\
Middle English, from Old English ēow, dative & accusative of gē you; akin to Old High German iu, dative of ir you, Sanskrit yūyam you
Before 12th century.
The one or ones being addressed —used as the pronoun of the second person singular or plural in any grammatical relation except that of a possessive <you may sit in that chair> < you are my friends><can I pour you a cup of tea>
— used formerly only as a plural pronoun of the second person in the dative or accusative case as direct or indirect object of a verb or as object of a preposition — compare thee, thou, ye, your, yours.
And while we're on the subject of the abysmal state of the written English language I'd like to direct your attention to the following collection of wisdom. Please be warned that some sensitive people may find the wisdom a tad offensive and if you do find it so my suggestion is to get over it.