Why indexing of backlinks is important to rank higher in SERP?

https://www.callupcontact.com/b/businessprofile/Caterweb/7578509

http://tupalo.com/en/johannesburg/caterweb

https://www.storeboard.com/caterweb

https://teleadreson.com/caterweb,56-heidelberg-rd,-johannesburg,-gauteng,-2000,-south-africa-I12LACNdiwA.html

https://www.brownbook.net/business/49048478/caterweb

https://www.hotfrog.co.za/company/1413205360144384

http://www.salespider.com/c-43263974/caterweb

http://caterweb.myonepager.com/

https://www.iglobal.co/south-africa/johannesburg/caterweb

http://www.lacartes.com/business/Caterweb/1808751

http://www.businessified.com/south-africa/johannesburg/professional-services/caterweb

https://www.localbusinesslisting.org/caterweb

https://gr8biz.co.za/south-africa/johannesburg/others/caterweb

http://www.ethioffer.com/south-africa/johannesburg/top-level-category/caterweb

https://www.directorytogoto.com/south-africa/johannesburg/industrial/caterweb

https://www.adlocalpages.com/south-africa/johannesburg/business-professional-services/caterweb

https://www.tuugo.co.za/Companies/caterweb8/0260003612947

https://dyrectory.com/caterweb-107111.html

https://www.mapfab.com/map/AVVU/Caterweb

https://nearfinderza.com/business/caterweb_599957+0.html

https://www.whatsyourhours.com/south-africa/johannesburg/professional-services/caterweb

https://www.directory.waitinggamepublications.com/south-africa/johannesburg/professional-services/caterweb

https://www.citiwaka.com/south-africa/johannesburg/business-services/caterweb