TREADMILL USERS: plz let me know whether A TREADMILL HELPS TO REDUCE BODY FAT AND WEIGHT OR NOT?

I'm a lil bit overweight and am luking 4ward to buy a domestic treadmill. To what extent will treadmill workout help me to reduce excess fat and weight. Is treadmill really effective way to reduce body fat. help me as i dont want my investment to go in vain. thanx
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