Hola Eli :-) en general, son lo mismo... = "tambien". Por ejemplo "Marcos y yo fuimos al parque. Su amiga, Maria, tambien vino." Mark and I went to the park, his friend, Mary, came too. Mark and I went to the park, his friend, Mary, also came. Mark and I went to the park, his friend, Mary, came as well. They all indicate the same. Here in the USA, I think that we use "also" and "too" most commonly.