Needed. You can not run, you can walk fast, you can do aerobics as such. The key is to be in the right heart rate zone. And at least 45 minutes. Then there will be a slimming effect.
If your goal is precisely weight loss, then aerobic exercise will be very useful. It is important for you to create a calorie deficit, and you can achieve it either by reducing the food consumed (and its calorie content), or by burning more calories. In the latter option, cardio training will help you - during them a lot of energy is expended.
But they will have little effect if you want not only to lose weight, but also to work out the relief or build muscle mass. To achieve your ideal figure, it is best to alternate between aerobic and strength training, or try functional training in the gym. Then you can lose weight and gain a beautiful body.
PS. If you plan to go on a diet and at the same time exercise in the gym, then strength training can even be harmful. Therefore, do not limit yourself too much in food. Losing weight on the conditional 1000 calories per day, coupled with training, is too much stress for the body.
Aerobic exercise helps burn fat. But only after a certain time. You can read how to run correctly here - https://www.proball.ru/blog/post/kak-nachat-begat/. But losing weight is not limited to one run. you need to eat right by consuming a certain amount of calories.
Required. The body is designed in such a way that when working with a certain pulse, somewhere after 30-40 minutes, fats are used, or rather their burning. A number of strength work will only strengthen your muscles and create a muscular corset. I would rather recommend functional training, in which you can not only improve your strength indicators, tighten muscles, but also get rid of adipose tissue.
To lose weight, you need to reduce the calorie balance, this can be done in 2 ways: reduce intake (eat less) and increase consumption (burn more in the gym). You don't burn a lot with strength training, besides, you can't limit the diet with heavy loads, but aerobic training is just right. Athletes "pitching" and train the cycle "on weight" and drying
To lose weight, you need only one remedy - to stop eating. Restricting food is harder than sweating for a full hour in the gym, but millions of times more effective. Take sports as a general strengthening and useful thing for the body, but not as a means for losing weight. When you gorge on another sweetness, reassuring yourself that you will "burn" it tomorrow in training, you are fooling yourself. I wrote a more detailed explanation here:
How to lie on the couch and lose weight - no joke.