Donating blood is vital because it helps save lives in medical emergencies, surgeries, and for patients with conditions like anemia or cancer. Blood cannot be manufactured; it is only through donations that it reaches those in need. 

Generally, healthy individuals aged 18 to 65, weighing at least 50 kg (110 lbs), can donate blood. However, specific eligibility criteria may vary by country and health regulations.

Typically, whole blood donations can be made every 8 to 12 weeks, depending on national guidelines. It's essential to allow your body time to replenish its blood supply between donations.

Yes, donating blood is safe. Sterile, disposable equipment is used for each donor, eliminating the risk of infection. Minor side effects like dizziness or bruising are rare and usually resolve quickly.

Typically, whole blood donations can be made every 8 to 12 weeks, depending on national guidelines. It's essential to allow your body time to replenish its blood supply between donations.