What is performance?

I believe performance to be anything that engages with an audience. One could associate the word 'performance' with a theatrical or musical element and this seems to be the most appropriate connection for me. The way in which a performance engages with an audience can vary; from a positive response to a negative, via a passive or forced upon performance. The size of the audience can range from one person to thousands and each and every member of that audience may or may not be affected by that performance. One also associates the word 'performance' immediately with actors and theatre elemnts such as stage designers etc., but does a performance have to necessarily comprise of these factors? Does it have to take place in a theatre? Can it not be a football match or a children's tantrum? For me, these are rhetorical questions because if any event connects with someone, that to me can be labelled as a performance. The quality and effectivness of this engagement though, gives a sense as to the quality and success of any performance, and this to me is what makes this