Bacon is salted and left to stand before either being dried or smoked before being sliced.
Ham is the same although it tends to be a different cut and often arrives cooked (although uncooked ham joints are available).
Its salted to preserve it.
....and hyper saturated salt-solution is injected into the bacon (and ham) to both bulk it up and add 'cheap' weight; the so called "added producer value" 
My local butcher doesn`t use any salt in his delicious, home cured, cold-smoked bacon and hams and amazingly they cost only the same as supermarket 'medium' ranges of pork/bacon/ham. 
Please support your skilled local butcher/poulterer; if we don`t they`ll soon be be gone and the retail 'giants' will be free to run a provisioning kleptocracy.
do you use Rhug farm shop?
I find the Rhug Estate meat to be superb, but a little at the luxury end of the price bracket for 'Deb`s towers'.
I meat-shop mostly at T.Roberts (situated at the Corwen end of the High St. in Bala)
http://tjroberts.wisshost.net/home-1.aspxA superb quality butcher and poulterer: Roberts have
"Welsh-Black" beef, local lamb, corn-fed free range large-chickens, a wonderful range of 'game': pheasant/poussin/rabbit/wild boar/partridge as well as his home produced cheeses, bacon and sausages (and he sells fresh garden-veggies too!)
Roberts deliver even small quantities locally around-here for free, but there is easy parking right outside the shop, Jimbob....well worth a visit.
