Verb conjugation is the creation of derived forms of a verb from its principal parts by inflection. Principal parts is sometimes the infinitive like "cantar" in Spanish, but it can also be verb theme like "skriva - skrev -skrivit" in Swedish.
The verb conjugation follows the rules of the grammar of a language. The language can be either a natural language spoken (or having been spoken, i.e., extinct language) by people or a constructed language "con-lang", such as Esperanto.
Verbix for instance contains the grammar of 100's of languages to support the automated verb conjugation.
Verb conjugation may be affected by person, number, gender, tense, aspect, mood, voice, or other grammatical categories.
Japanese verb conjugation, for example includes conjugations for different degrees of politeness.
All the different forms of the same verb constitute a lexeme and the form of the verb that is conventionally used to represent the canonical form of the verb (one as seen in dictionary entries) is a lemma. In Indo-European languages the lemma is typically the infinitive.
Conjugated forms of a verb are called finite forms. In many languages there are also one or more forms that remain unchanged with all or most of grammatical categories: the non-finite forms, such as the infinitive or the gerund. A table giving all the conjugated variants of a verb in a given language is called a conjugation table or a verb paradigm.
Verbix is designed to show the conjugation table for the lemma entered by the user.