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Clinical trials are research studies conducted to evaluate the safety and effectiveness of new drugs. These trials are typically preceded by pre-clinical studies, which assess a drug's safety profile and potential side effects. While pre-clinical trials focus on the initial safety evaluation, clinical trials aim to determine whether a new treatment is more effective than existing therapies. Clinical trials are carried out in several phases: Phase 0, Phase 1. Phase 2, Phase 3, and Phase 4. Phase 0 is designed to accelerate the drug approval process by providing preliminary data on how the drug behaves in the body. Phase 1 trials primarily focus on determining the appropriate dosage and identifying potential side effects. In Phase 2, researchers assess the drug's safety and effectiveness for a specific condition or disease.. Phase 3 trials compare the new treatment to standard treatments, evaluating its overall safety and efficacy on a larger scale. Lastly, Phase 4 trials, conducted after the drug has been approved, aim to monitor its performance in real-world scenarios. These post-approval studies further assess the drug's long-term effects and ensure its continued safety and effectiveness for the approved indication.