anchor tag is not properly working in my Laravel site

In my Laravel site I want to link up my facebook account with the website but it is not working properly. If I am using

<a href=""></a>

for that, link shown like this

https://myDomainName/www.facebook.com/my_fb_page_id

But if I want to show only the facebook link with my fb id, for that I have used

<a href="www.facebook.com/my_fb_page_id"></a>

For that also the link shown same like below

https://myDomainName/www.facebook.com/my_fb_page_id

Where is my fault. Can't figure it out.

Anybody help please ? Thanks in advance.

via Chebli Mohamed