You will need:
Fresh or dried Cilantro
3 tomatoes, chopped
1 onion, chopped
1 tablespoon lemon juice or vinegar
1 clove of garlic, chopped
1 jalapeno, diced (optional)
1 teaspoon salt
Mix the chopped ingredients in a bowl and salt to taste.
Add half the jalapeno then taste. If you are looking for more of a kick, add the rest of the jalapeno.
The difference between Pico de Gallo and Salsa is very small.
They are made with the same ingredients but Pico de Gallo is raw coarsely chopped vegetables while Salsa's a ground or blended sauces and spices.