When it comes to something being spontaneous, what does it mean?
I know its something that goes out without no outside force or something like that but what are example of something that is spontaneous ?
Spontaneous Process is reaction without having to input energy. Spontaneous reactions will proceed to products automatically, typically releasing energy. Rusting of Iron is an example of chemical spontaneity. 2Fe^o + 3O2 => Fe2O3(s) => Rust. Also, your car battery functions on the coupling of reactions that proceed to products spontaneously when the car ignition is engaged. From a more simplistic mechanical point of view, consider holding a ball on an incline, then releasing. It will proceed down the incline under the action of gravity without any additional input of force, work or energy. That is also a spontaneous process.
In contrast, a non-spontaneous process requires the input of energy in order to drive a chemical reaction. If you have observed the decomposition of water into hydrogen and oxygen, you will note that the water contains 'electrodes' that are connected to a battery or transformer pushing electrical energy into the water forcing the water to breakdown into hydrogen and oxygen gas. This is an example of a non-spontaneous reaction because energy input is required. A simplistic mechanical example is to consider a ball at the bottom of an incline. The ball will not move 'up' the incline on its own power. Something has to 'push' the ball up the incline by the input of work energy.
The two concepts are frequently categorized as follows (in the field of electrochemistry) ...
Spontaneous Electrochemical Rxns => Electrical Energy (Car Battery)
Non-Spontaneous Electrochemical Rxns + Electrical Energy => Chemical Rxns (Decomposition Reactions => HOH => Hydrogen gas + Oxygen gas.