Pico de gallo is a type of salsa, but when people refer to salsa, they often mean a more liquidy sauce with some pureed or crushed tomatoes. This fresh tomato salsa is made up of mostly chopped vegetables and herbs, with only the juices from the tomato forming the liquid that holds the salsa together. If you want a less watery pico de gallo, then you can drain the juice from the salsa before serving (but you should add that liquid to a sauce or soup!).