Unleavened bread was one of the foods the Jews in Egypt were commanded to eat along with the paschal lamb (Exodus 12:8). In commemoration of that first seder meal, and the haste in which the Israelites left Egypt — giving them no time to allow their bread to rise — we eat matzah at the seder (and instead of bread throughout the holiday).
Roti, Chapati & Paratha are all Indian flat breads. They are made on a flat top griddle or tawa. They are similar but there are subtle differences: ROTI is a traditional unleavened whole-wheat bread which, depending on the country and the cook, can be as thin as a"skin" or soft and pliable, closer to a pita.