When pickling you do need salt to pickle for the safe preservation of the pickles.
If you do not use salt to pickle then the pickles can spoil faster and make you sick so you should always use salt to pickle with when you want to make pickles that are safe to eat.
You can however also use hot peppers, garlic and herbs to pickle with as well.
But it's best to use pickling salt to make pickles with.
The only difference between table salt and pickling salt is that regular table salt is made of sodium chloride while pickling salt is made of pure granulated salt.
The other difference between pickling salt and regular salt is that pickling salt is pure granulated salt while regular salt which is made of (sodium chloride).
The pickling salt is different also in that the pickling salt unlike regular salt does not contain anti-caking ingredients, which can turn your pickling liquid cloudy, nor does it contain additives like iodine, which can make pickles dark.
If you want to make good pickles then you need to use pickling salt and not regular salt.
If you use regular salt the pickles or anything else you pickle with regular salt will not turn out good.
Regular salt is not pure salt while pickling salt is pure salt without any additives and regular salt usually contains other additives.
Always use pickling salt or preserving salt when pickling if you want your pickling to turn out good.