Selective Serotonin Reuptake Inhibitors, or SSRIs, are a class of medications commonly used to treat depression and anxiety disorders. They work by increasing the levels of serotonin, a neurotransmitter in the brain that helps regulate mood, emotions, and behavior. By preventing the reabsorption of serotonin, SSRIs enhance its availability, which can lead to improved mood and reduced anxiety. Common examples of SSRIs include fluoxetine, sertraline, and escitalopram. These medications are generally considered safe and effective, but they may have side effects such as nausea, insomnia, or sexual dysfunction. It is important for individuals to consult with a healthcare professional before starting or stopping any medication.