Quantum computers are systems that use principles of quantum mechanics. Classical computers represent information with bits, where each bit is either 0 or 1. Quantum computers use qubits instead.

Thanks to superposition, a qubit can behave like a combination of states. Quantum properties such as entanglement can provide different computational possibilities for certain types of problems.

Quantum computers may be useful in optimization, cryptography, materials science, drug discovery and complex simulations. However, the technology is not yet ready for broad everyday use.

Quantum computers should not be seen as direct replacements for classical computers. They are specialized platforms that may be extremely powerful for specific problem categories.

Developments in this area also affect security. Some classical encryption methods may become vulnerable to quantum algorithms. This is why post-quantum cryptography is gaining importance.