When you visit any website, using normal, unencrypted protocol (http://...), then whole transmission between your computer and destined server is realized with so called "open text". It means that, if this transmission would be intercept it will show an entire content to the person who made this interception. For that reason, all services which respect themselves (like httpS://servizza.com) should secure all connections or at least some of it (for example sending data which is needed for logging in). It is possible thanks to SSL protocol, and consequence of this act is small change of web adress from 'http://...' to 'https://...'. Thanks to that protocol whole transmission is highly encrypted, very hard to decrypt.
If you want to use this kind of encryption you need a proper certificate, which is an electronical attestation of third site. There are many companies on the market which offer SSL certificates, most often in anually period, in different price options. Cetrification prices vary between few to few hundred, event thousands PLN for a year and depends on many variables, financial warranty. They have a different level of security as well.
Before making a final decision, check current offers, familiarize with detailed conditions and choose right offer, which will suit your needs. In case of most 'regular' services, usually cheaper propositions should be fine. You can even consider free options. For example, as part of Servizza's offer, for every container hosting a free AutoSSL is given (Lets Encrypt).
