A favicon (short for "favorite icon") is an icon associated with a website intended to be used when you bookmark the site. Web browsers use them in the URL bar, on tabs and elsewhere to help identify a website visually.
WordPress has implemented Site Icon feature that enables favicon in your web site. You just need a square image that's at least 512 pixels wide and tall.
Follow the below steps to set favicon in your site.
1) Prepare image file. It must be square, and at least 512 pixels wide and tall.
2) In the backend, find the theme name (etc Jael) > Themify settings > General
3) Upload your image
4) Save settings