You can google any number of confusing definitions of quantum computing. Simply put, quantum computers are machines that leverage the attributes of quantum physics to store data and perform computations. Clear as mud.
The best way to understand the value of quantum computing—or lack thereof—is to understand the use case. Quantum computing can be advantageous for certain tasks where it can vastly outperform even supercomputers. It is typically associated with the following use cases: cybersecurity, pharmaceutical development, financial modeling, improving batteries, cleaner fertilizer, traffic optimization, weather forecasting, climate change, artificial intelligence, solar capture, and electronic materials discovery.