Pico de Gallo is always raw, large course chunks, usually white onion, tomatoes, chile ---usually jalapenos or serranos, and cilantro. Season with salt and lemon or lime juice to taste. Pico de Gallo translates literally to: rooster beak, but means: to corse chop like using a beak to do the job (instead of a knife)
Salsa Fresca translates and means fresh sauce (not cooked).
Salsa Fresca is always minced raw chile, usually chili guerrito (yellow) or another mild to medium chili, green onion, cilantro and cooled boiled water. Any other raw ingredients are to the cook's fancy, such as tomatoe, white onion, multiple chili peppers, avocado, mango, bell pepper, etc. Season with salt to taste.
at 11:35 AM on Dec. 7, 2010