Two Pickle Methods: Vinegar or Salty Water
People have pickled food for a very long time. Before refrigerators, pickling helped families keep cucumbers and other vegetables from spoiling. There are two main ways to do it, and they work in different ways.
The first way uses vinegar. A cook pours a mix of vinegar, water, and salt over the vegetables in a jar. Vinegar is sour, and the sourness makes it hard for the germs that spoil food to grow. These pickles are ready quickly, sometimes in just a day or two. They taste sharp and crunchy.
The second way uses only salty water, called brine. The cucumbers sit in the brine for days or weeks. Salt keeps most spoiling germs away, but one helpful kind of bacteria likes the salt. As the bacteria grow, they make the pickles sour on their own. This is called fermenting. The flavor is deeper and more complicated.
Both kinds of pickles can be tasty. If you like a fast snack, vinegar pickles are a good choice. If you like a slow, bubbly flavor, you might prefer fermented ones.