What are the relationship between the Vedic text and Vedas?

There are the four Vedas (the Rig, Yajur, Sama and Atharvana Vedas) but the period of the development of Hinduism in which they were written (and some time before that) is sometimes referred to as the Vedic period. So, hypothetically, any text from that time could be "Vedic" but as a general rule the Vedic texts are the texts that only come from the four Vedas.