Quantum Physics

Thats quite a broad question. Quantum physics entails a lot of subjects and many appliacnces. I suppose it ultimatly comes down to the fact that all particles can also behave as waves, the so called wave-particle dualtiy. This is kind of confusing as it comes from the fact that subatomic particles sometimes behave like particles and sometimes like waves. This wave behaviour leads to particles and events being described my possibilities (i.e. you can only say that an object has a probability of being in a certain place). This is the basis behind quantum physics and means that physisits can only ever have so much knowledge about sub atomic particles and forces as they can never be described to 100 % accuaray and are based on probability functions. Many scientits have disliked this idea and refused to belive or acknowledge it, most famously Ensitien who said "God does not play dice". However due to the vast amount of experimental data quantum physics is probalaby one of the most validated theories there is. I hope this has helped you somewhat.