Articles are a type of adjective.

Russian speakers, in particular, have trouble knowing when to use articles. Actually, pretty much everyone has trouble with them, apart from Arabic and western Europeans and their descendants.

Why do we say "I like the sea" but "I will travel by sea"? Why "I have a car" but "I travel by car".

See this article by Grammar Girl.

In one of Margarita's recent letters, she wrote she wanted to complain about "burning rubbish at my neighbors house". I am going to suggest to her that is would be better to complain about "the burning of rubbish". This illustrates one way articles can be used to differentiate meaning. "Burning rubbish" sounds like the rubbish has caught fire by itself, while "the burning of rubbish" sounds like someone is setting it alight.