Yes, travel insurance is required for all Schengen visa applications, including Sweden Visit Visa. Your insurance should cover at least €30,000, be valid in all Schengen countries, and last for your whole trip. It must pay for medical emergencies, hospital stays, and getting you back home if needed. If your insurance doesn't meet these requirements, your visa could be denied. Make sure the certificate shows the correct coverage and travel dates, and keep a printed copy with you while traveling.