From Summer Bocks Program a brief description better than I can explain on Lacto-Ferments .
"Fermentation happens in an anaerobic environment (without oxygen). An anaerobic environment is created with the salt water brine. Lacto-fermentation is when respiration occurs without oxygen. This also happens in your muscles when you work out. They produce lactic acid as a byproduct of making energy when you run out of oxygen.
Bacteria are responsible for the fermentation of vegetables. Lactobacillus (Lactobacilli) make energy and respire without oxygen in your jar or crock and produce lactic acid as a byproduct.
Lactic acid bacteria proliferate in an ecological succession as the pH changes over time. A common example of ecological succession is the regeneration of a forest after a fire. In this system, the pH of the soil changes over a period of time, influencing the ecology and the order in which plant and animal life are able to survive and proliferate. At first, the forest floor will regenerate, then flowers and shrubs will start to grow. As the pH changes, influenced by new life, trees will grow and the balance of the forest returns."