Here is an example of a website banner image for a new phone from Samsung:

Example of a website banner

Now, notice how this tweet has a similar aesthetic to the website banner:

Example of a tweetAs does this video on their YouTube channel (which also shares the same branding and style as their TV ads):

Example of a marketing video

No matter where Samsung happens to be telling you about this phone, the message and experience is consistent across content formats and channels. That’s cross-channel marketing in a nutshell.