Subdomains are second level of domains or its substiture. If main domain is www.mymaindomain.com, then subdomain can be http://subdomain.mymaindomain.com.
Merits:
1) Cost Saving: If any organization want to buy 100 domains for different subject it will cost (100*perdomain cost). But subdomain cost free. So it will cost 0 for 1-10000 (depending upon provider how many subdomains they provide.) subjects.
2) Since all search engines treat subdomains as different for indexing. Like www.mymaindomain.com AND http://subdomain.mymaindomain.com are two different domains for search engines. So website owner get all the benefits of keyword rich website without registering extra domain and hosting cost.
Merits:
1) Cost Saving: If any organization want to buy 100 domains for different subject it will cost (100*perdomain cost). But subdomain cost free. So it will cost 0 for 1-10000 (depending upon provider how many subdomains they provide.) subjects.
2) Since all search engines treat subdomains as different for indexing. Like www.mymaindomain.com AND http://subdomain.mymaindomain.com are two different domains for search engines. So website owner get all the benefits of keyword rich website without registering extra domain and hosting cost.
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