DTM data layer

Here is the official AEM docs on this subject:

http://docs.adobe.com/docs/en/aem/6-0/administer/integration/marketing-cloud/dtm.html

I will search to see if there are other pieces of content on this use case. 

Thanks for the reply

We are currently on an older version, CQ.5.5 . The aim is to 'somehow' populate the data layer, so the information populated are passed on to DTM

What i need to find out is how i populate the data layer object and also how  do we send custom events to DTM

Previously with direct sytecat  integration we would fire event tracking by using adv.trackEvent from s_code. How can we 

1) Populate and send data layer to DTM

2) Fire event tracking i.e. similar to sytecat adv.trackEvent

Great! Data Layer is clear

Regarding custom events such as lets say click of one of the social links. Do we implement something like ?

Code generate by component

<a href=”http://facebook.com” onclick=”trackClickInteraction();”>Social Link</a>

create a JS external file which is included in each page

this.trackClickInteraction = function() {

..........

s.tl(....);

}

Does the above seem like a reasonable solution? Do we need to include onClick event  and s.tl call, or DTM uses a different mechanism to capture custom events?