The new HTML semantic elements

[DigNap15]

With HTML 5, they introduced some new semantic lemenst, head, main, section, article, aside.
Does anyone use this
I cannot see any difference in them in actual practice.
And with CSS grids the terms are all mixed up.

 

[martinsmith]

A semantic element clearly describes its meaning to both the browser and the developer are semantic elements <form> , <table> , and <article> - Clearly defines its content..