Who is Barock Obama and actresse rite?

my friedns tak aboute him somtimes but i dunno who he iz an im to afreid to ask dem cuz theyle thinck im dumbe. i thinke hes an athleete or sumthing but i not sure or an actresse can somone tell me who he iz and also som infoe so i can joine in the conversatione withe my frends? thankes.