Think of a deck of cards. If you knew which cards would be drawn one after the other, it won't be random to you.
But because the order of cards are unknown to you, they appear random.
To the person who put the deck together, he's completely in the know.
Think of random dots.
To the outsider with lack of knowledge they appear random. But to the creator, these dots their movement and behaviour can be based off meanful data.
In like manner is the universe, what you perceive as randomness is just your lack of knowledge.