"this is not a pipe"
Semiotics enables us to more easily identify the advertiser target market. it is a very useful tool to de code advertising.
Semiotics is present in everything in our lives, it's so deep that we don't really pay attention to it as it happens so naturally.
Semiotics is the study of signs, and through them, it studies the origins of meaning in different languages of communication.
Here are a few quotes that i found in relation to semiotics...
"To process the product is to 'buy into' the myth, and to possess some of its social value for ourselves."- Bignell 2002
"Advertising has been critiqued as one of the social institutions which peform this function of naturalising dominant ideologies in our culture." - Bignell 2002
Here is an example of semiotics in advertising.......
i found this on...
http://www.snap2objects.com/2009/07/03/semiotics-a-powerful-communication-tool-for-designers/
It talks you through how semiotics is evident within this advert.
Example I: Words hurt too

Let’s start with this clever ad about verbal violence (click to enlarge). The main element is the boy’s picture. So, you instantly think: “it’s an icon, because icons are real representations like photos”. Ok, but no. It is surely an icon, yet more than that.
As we said that all signs can belong to the three kinds,this one is more symbolic. See, the boy looks upset, looking down, pale colors, showing sadness. These perceptions are primary indexes, because the eyes looking down, for example, is an indicator of sadness. BUT when we understand that this boy has suffered violence, it becomes symbolical and subjective.
The “words/blood” coming out from the boy’s nose is another index (indicating violence) that becomes a symbol. There’s no real blood, the written words are giving this idea, again, subjective. If I didn’t know what is this about I wouldn’t understand the image, it was important to have a previous knowledge about the concept “words hurt too”.