This is the largest Russian dictionary where you can find translations in several languages. The dictionary not just contains words you use in your daily life, but also more difficult constructions, like words you use at certain themes (business, logistics, history, technics).

Of course, you can do anything you expect from a dictionary, but there is more: It also has an extensive word trainer! This trainer is personal, which means you can add all the words to your personal dictionary and learn those words with the word trainer.
The word trainer has different exercises, which makes you practice all that is necessary: Your writing skills, your listening skills, your pronunciation, and your reading skills.