Yeah, me too. :) I hope my explanation makes sense to you.
Also you can look through Wiki: "Analytic language" & "Synthetic language". English is analytic and Russian is synthetic.

"For comparison, nouns in Russian inflect for at least six cases, most of them descended from Proto-Indo-European cases, whose functions English translates using other strategies like prepositions, verbal voice, word order and possessive ’s instead."