Is giving TIP a MUST?

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Here in the Philippines, its ok if you dont give tip in hotels, restaurant, malls or any other establishments, its not a MUST! Its ok to give tip, thats the customer discression to give tip or not. There this local mall in Cebu that even post a big notice for the customers to see that its not a must to give tip like for instance we have lots of groceries and we need baggers help to bring the groceies outside, the management even discourage customers from giving tips. For me, if i visit a salon for massage or manicue/pedecure, i make sure i give out tips, a part also of saying thank you for giving me good service. although there are times that i dont give tips but most of the time, i do give out tips to people, im just fortunate enough i landed a job that give out better pay. I talked to my cousin who just arrived in Nevada last february and she told me that its a MUST to give tip in US? Is that true? She said you're rude if you dont give out tip? Is that a practice already? i asked her what if you have enough money for food in a certain restaurant, are you still obliged to give tip, she said then eat at home. Well, i respect that there are some countries that practice that, it also help in any way especially those low earning employees with their pay right? in a way customers are able to help. what about you, do you give out tips?