We crush the grain to expose the starch.
Water mixes with the crushed grains, causing the starch to convert to sugars. sugary liquid = sweet wort
Sweet wort is transferred to the kettle and brought to a boil. Hops added = bitter wort
Bitter wort is transferred through a heat exchange, cooling the bitter wort down on its way to the fermenter.
Yeast is added to the bitter wort where it converts sugar into alcohol CO2 and other flavour compounds.
Once the beer carbonates in the serving vessel. It is brought straight to our taps. It doesn't get much fresher than that.