De or het webvertising?

The correct Dutch article is:

de webvertising

Rule Words ending in -ing: almost always de. See the rule
Meaning (Dutch) adverteren op het internet

How to use webvertising

the webvertisingde webvertising
this webvertisingdeze webvertising
that webvertisingdie webvertising
our webvertisingonze webvertising
your webvertisingjouw webvertising
every webvertisingelke webvertising
which webvertising?welke webvertising?
a big webvertising / the big webvertisingeen grote webvertising, de grote webvertising

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).