This page, talks about Quantum Computing, how it works and how it is different from the "classic" computer. A classic computer processes bits that can either be 0 or 1. However, quantum computers allows multiple interesting algorithms because they use qubits, which can exist in any superposition of 0 and 1 and are also represented by complex numbers. The website says that when N qubits are in superposition 2 states are created as opposed to 1 state which a class computer creates. This may sound complicated, but is considered a "basic property" of quantum computers.
Basic operations on quantum computers are defined by quantum gates. These gates allow the ability to build complex algorithms. Quantum gates are reversible which allows a program to execute both forward and reverse.
The actual site, Quantum Computing Playground, allows users to simulate quantum registers up to 22 qubits and run algorithms. The site also gives you examples that you can try including a step by step demonstration.
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