A smiley is most commonly used to convey an emotion in text communications for chat programs and on the World Wide Web for bulletin boards. They help convey a real life voice change or facial expression which are difficult to perform in text messages. A message conceived as rude or insulting in text can be transformed into a joke with a happy smiley logo. They are therefore very useful to help people not misinterpret the intent of a text message. Below is an example of some of the most common smiley logo's

And also for applications that only support text users can use the below emoticons,

^_^ - happy

=_= - bliss

u_u - sad

x_x - tired

*_* - admiration

(#_#) - beaten up

o_o - shock

._. - puzzled

($_$) - money mad

(?_?) - what?

(z_z) - sleepy

T_T - crying

>_< - anger

^_- - joke