This study will test olatorepatide (study drug) to determine how safe and effective this drug is and how easily your body can accept this drug without causing side effects, as well as how the drug is processed in the body by participants with overweight or obesity. The study will test how safe and effective the study drug works compared to placebo in people who are overweight or obese but do not have diabetes. The study is looking at: * What side effects the study drug might cause * How much the study drug is in the blood at different times * How well the study drug works * If your body makes antibodies to the study drug, as this may cause the study drug to not work as well