Tarps Also Good For Simple Tent

Every time when there's an occasion in the house, I've noticed that the tents they are using for shades made from the tarps. The tents are built outside and at the backyard of the house so that the visitors will be protected from the heat of the sun and also from rain. It's a simple tent only made from tarps and I realized that tarps are best for any uses and also they are very useful especially at home use. People used to build tents that made of tarps when there's birthday party, wedding, burial and many other parties and occasions. I was thinking if there's no tarps, what would be the good alternatives to use as a tents? Maybe there is if they want to spend big money to have that but in my own opinion, tarps are the best to use as a tent and also very affordable and heavy duty. So, If I would have a tent, I should have tarps to use.