The suffix it's a kind of morpheme (minimal linguistic unit whose meaning either modifies or completes the meaning of a lexeme) added after the lexeme of a word. The lexeme is a minimal lexical unit that lacks morphemes.
So, suffixes are linguistic sequences that are postponed in a word or lexeme in order to modify its reference, either grammatically or semantically; they are joined behind, at the base of the word in question, for example, courtship, silly, among others.
When writing a suffix, it must be taken into account that the derivative resulting from the union of a base and a suffix will always be written in a single word.
There are two types of suffixes, derivatives or inflections. In almost all languages, derivatives precede inflections, because derivatives have a tendency to be closer to the root.
Some examples of suffixes are: -aceous (crustacean), -aco (libraco), -ano (villager), -ario (concessionaire), -azgo (courtship), -ble (notable), -ción (prohibition), -dero (sprinkler), -dor (talkative), -edo (oak), -ero (engineer), -eño (Madrileño), -ico (journalistic), -ismo (conservatism), -ito little brother), -menta (clothing), -oso (slippery) , -trix (actress), -udo (bearded), -ura (wrap).
It should be noted that suffixation is a fairly widespread process in most human languages at the behest of the formation of new words, approximately 70% of the languages spoken and written in this world widely use suffixation and around 80% use it consistently.
Both prefixes and suffixes are not words but affix elements lacking autonomy that are necessarily linked to a lexical base to which they will contribute different significant values, giving rise to the formation of new words.