Is there an equivalent to "tafsir", but for hadith?

Qur'an verses are often explained in tafsir , and there tafsir available online such as at altafsir.com . I'm wondering if there's an equivalent for hadith, i.e., detailed explanations of particular hadith. **Question**: Is there an equivalent to "tafsir", but for hadith? The closest I'm aware of is a fatwa , which (among those I usually encounter) discuss a problem using the Qur'an and sunnah, and sometimes in detail.