Semiosis is the performance element involving signs. Although a human can communicate many things unintentionally, individuals usually speak or write to elicit some kind of response. Yet there is little real explanation of how semiosis produces its effects which is odd given that the word "sign" is in everyday use and most people would understand what it means. But semiotics has not offered clear technical definitions, nor is there agreement about how signs should be classified. So what, if anything, can be said with certainty?