what is header in web scrapping code example

Example: web scrapping website header

<img class="aligncenter size-large wp-image-84470" src="https://365datascience.com/wp-content/uploads/2020/04/headers-user-agent-1024x86.png" alt="request headers user agent, user agent string" width="640" height="54" srcset="https://365datascience.com/wp-content/uploads/2020/04/headers-user-agent-1024x86.png 1024w, https://365datascience.com/wp-content/uploads/2020/04/headers-user-agent-300x25.png 300w, https://365datascience.com/wp-content/uploads/2020/04/headers-user-agent-768x65.png 768w, https://365datascience.com/wp-content/uploads/2020/04/headers-user-agent-600x50.png 600w, https://365datascience.com/wp-content/uploads/2020/04/headers-user-agent-610x51.png 610w, https://365datascience.com/wp-content/uploads/2020/04/headers-user-agent.png 1343w" sizes="(max-width: 640px) 100vw, 640px" />