Cervical lordosis is a curve in the cervical spine, the area of the spine which contains the neck vertebrae. This curve is entirely normal and in fact desirable because it helps to stabilize the head and spine, but when the curve straightens out, becomes too deep, or faces in the wrong direction, it can become a problem.
If something's canonical, it follows a principle or rule, usually in a religious or church-related situation. It is also used in mathematics, music and can refer to something reduced to its most basic form.
If youâre not familiar with the term, simply put, a canonical URL is the authoritatively correct URL for a resource. To help illustrate this point, letâs say each of the following URLs is a means to access the homepage of your site: 1  http://www.yoursite.com/. 2  http://yoursite.com/.