The second section of the Vedas is called the Brahmanas. Here Brahmanas does not mean the Brahmin caste; it is a section of the Vedas that deals with an elaborate system of ritualistic performance, including sacrifices into the holy fire, all which is very elaborate indeed.
The third section is called the Aranyaka. Advanced seekers began to feel that it is not always necessary to have gestures and rituals in order to contemplate on the gods. We need not even offer prayers through words of mouth; the Veda mantras also may not be necessary if the thought is concentrated. A time, a state, a stage arises where we need not utter a mantra or a word of prayer to the god, or show a gesture by way of ritual to satisfy the god; our hearts can well up by contemplation only. I can deeply feel affection for you without any kind of outward demonstration of it and that is enough. That is called dhyana, or meditation. A contemplation in sequestered places, in forest areas, in isolated spots - aranya, ...more

The second section of the Vedas is called the Brahmanas

The third section is called the Aranyaka