Cloudflare is a website security company which provides a CDN (Content delivery network) and DNS (Domain name server) along with other security products, including DDoS mitigation. Woosmap APIs rely on Cloudflare to serve high quality, relevant and blazing fast services across the world.
As part of the Cloudflare solutions, mandatory cookies are set to ensure security and stability. These are mandatory cookies that cannot be deactivated. You can learn more here.
[Update]
Cloudflare removed the __cfduid cookie and the cf-request-id headers during 2021, so you will no longer see __cfduid on your site. The Cloudflare page linked above lists the cookies it sets today.