Do you know greeting..?
greeting is an act of communication in which human beings ( as well as other mambers ) Intentionally make their presense known to each other, to show attention and to suggest a type of realationship or social status...
Invitation is the invitation given by one person to another, to attend an important event, such as birthdays, anniversary, school graduation, separation etc...
hi friends, I will tell you about Advertisment ^.^
Advertisement is information for persuading and motivating people so that they will attract to the service and the thing that are offered or informed.