What is a latin present infinitive?

In Latin, the present infinitive of a verb is a verbal noun that refers to the action denoted by the verb without specifying subject, time, or mood. It ends in "-re" when active and "-ri" when passive. For example, the present active infinitive of the verb "canere" (to sing) is "canere", while the present passive infinitive is "canēri". The present infinitive can act as a nominative or accusative noun depending on its place in the sentence.