The Yajur Veda is the second samhita.
It is later than the Rig Veda. It may be dated around 1000 BCE or earlier.
While the Rig Veda has references to rituals and ritual sacrifices, the Yajur Veda was specially composed for rituals. It has both verses and prose passages specially arranged for recitation during yajnas [sacrifices]. They are known as yajus.
Many verses from the Rig Veda are found in the Yajur Veda but they are arranged differently.
The Yajur Veda has several shakhas or branches with different versions of the text. The two main versions are the Shukla [White] Yajur Veda and the Krishna [Black] Yajur Veda. Even these have variants.
The Vajasaneyi Samhita is the text we have of the Shukla Yajur Veda. The two variants or shakhas of the Vajasaneyi Samhita that are known today are the Kanva and Madhyandina.
The Vajasaneyi Samhita has forty to forty-one adhyayas [sections or chapters]. These are subdivided into khandikas. Each khandika contains a prayer or mantra.
The Krishna Yajur Veda contains the prayers of the first half of the Vajasaneyi Samhita. It adds to these with explanations.
There are many variants of the Krishna Yajurveda. Among them is the Taittiriya Samhita. The Taittiriya Samhita has seven kandas or sections, subdivided into prapathakas, which are again subdivided into anuvakas for recitation.
In the Yajur Veda the gods are the same as those in the Rig Veda.
The sacrificial rituals described are many. They include the agni or fire sacrifices, the chaturmasya or four-monthly sacrifice, the ashvamedha and other animal sacrifices, and the Soma sacrifices.
More will be added later on the elaborate sacrificial rituals that developed.