Some papers offer a free, basic announcement as well as larger, paid announcements. The invitations shape your guests' first impressions and will begin to set a mood for your wedding, whether traditional or contemporary, formal or informal. Formal invitations are typically engraved. The print is pressed into the paper and ink is flowed over it. If you look at the back of an engraved invitation, there will be indentations on the back.
More common today is thermography.
This is a heat process, and if you run a finger over the letter of an invitation, it feels raised. Either one is completely acceptable and looks beautiful. Less formal invitations can be ordered from a stationer or even made by the bride and groom. With an amazing array of materials and papers to choose from at custom paper stores, there's no limit besides your imagination. There are lovely cardstock papers with floral motifs.