Final answer:
An epidural block is administrated in the epidural space of the spine to provide targeted pain relief, commonly used during labor, surgeries and for chronic back pain management.
Step-by-step explanation:
An epidural block is a regional anesthetic technique primarily used to provide pain relief during labor and surgical procedures. This procedure is administrated in an area known as the epidural space, which is located in the spine outside the dura mater of the spinal cord. The significance of an epidural block is its ability to provide targeted pain relief, allowing for a decrease in overall anesthetic requirement and improved post-operative outcomes. It is also significant for its role in managing chronic back pain and for treatment during labor and delivery.