"Going to": The future tense with "going to" is more commonly used in spoken language when you want to refer to the immediate future, that is, something is about to happen. Examples: She is going to pay with a credit card = She will pay with a credit card (which is about to occur).

É usado para falar sobre situações ou eventos que foram planejados, existe uma grande chance de acontecerem. Quando se tem certeza do que vai acontecer, uma decisão já tomada. For example: "We are going to eat pizza tonight." "I'm going to paint it white."