It means there is an alternating current (AC) with a root-mean-square or rms potential (voltage) of 220 V available between the two lines that can do work on a resistive load applied across the two lines. For example, turn the shaft of a motor, illuminate a light bulb, heat a water heater... the sort of thing which never happens spontaneously without a source of power, no matter how long or how hard you stare at the wires.
The answers to this type of question are available online using a search engine, such as Google. Such questions are generally inappropriate in a discussion forum, such as this one you now appear to be trolling. This is NOT a teaching forum. If you need education (and it is quite apparent that you do), seek it elsewhere and then come back here to ask questions pertaining to a particular topic of discussion or project your education has led you to discover.
Something like that. 220 VAC represents the amount of energy available to do work. Try Google for further enlightenment.
Touching a pair of "live" wires completes an electrical circuit that begins at the power plant providing the electricity and includes all the wire coming and going from the power plant to the load, which would be you! Internally the human body is a good conductor of electricity, so moving electrical charge through it will result in electrocution. Best not to touch "live" wires to avoid getting electrocuted.
Again, best to Google this. There are all kinds of potential, but they all boil down to meaning the ability (the potential) to do work.
As I mentioned before in post #5, voltage is the negative gradient of an electrical field. Voltage is not a particle. You will need more than grade-school arithmetic (add, subtract, multiply, and divide) to grasp the concept.
There are two kinds of electrical fields, represented by opposite polarities of positive and negative. The Universe appears to be constructed of atoms, each atom having a positively charged nucleus consisting of positively charged protons, uncharged neutrons thrown in for flavor and versatility, all surrounded by a negatively charged cloud of electrons, equal in number to the number of protons. Each of these particles carries the same charge or no charge: positive for protons, negative for electrons, no charge for neutrons. From a distance, the two fields, positive from protons in the nucleus and negative from electrons paired with the protons, cancel each other so that matter ordinarily appears without a charge. There are many ways to alter the balance between positive and negative charges, but they always require the expenditure of energy to do so. This is a topic of physics and Google or a library is a good place to start learning about it.