What is hand drawn beer?

Answer 1

It is a beer that is pumped from the keg rather than dispensed using the more modern CO2 dispensing system. This results in a beer having a softer flavor due to the lower content of CO2.

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Not sure what you mean by "softer" flavour. The gas doesn't affect the flavour because it has no flavour of its own. However it will make the drink slightly fizzier, especially if served over-chilled - which reduces the flavour by damping the sense of taste anyway. (Beers should be served cool, not chilled to near freezing-point, unless you like it insipid!)

There is though a more important difference. Cask-conditioned beers (to give the technical description) still contain a trace of live yeast which feeds on the sugar in the beverage to produce the CO2 naturally, and without which the beer would be "flat", though not to the extent necessary to force the beer from cask to pump by its own pressure. Keg beers are filtered and pasteurised so need the CO2 injection to give them sparkle as well as dispensing lift.

Incidentally there is a curious North-South divide in England, over the "head", or froth of CO2 bubbles, on the served beer. [Odd - the font size suddenly changed.] Northern drinkers swear blind that the ale is "flat" without it; Southerners prefer, or at least are happy, to have no head on their beer. In fact there is no difference, as long as the liquid reaches the legal line on the glass: the head is produced artificially by a dispensing nozzle that forces the gas to effervesce. It's a matter of preference rather than quality.