TLD is an acronym, which stands for "Top-Level Domain", and SLD is an acronym, which means "Second-Level Domain". For example, in the domain "my-domain.com", the Top-Level Domain is ".com" and the Second-Level Domain is "my-domain".
Domain Name Registration Services Provided by ChStack
At ChStack, we offer an array of domain name extensions (.com, .net, .org, .info, .biz, .us, etc.) at a reduced price with their business-class shared hosting. An array of other generic and country-code Top-Level Domain extensions are offered at a standard price both on the signup page and inside the web hosting Control Panel. Comprehensive info about the TLD extensions on offer can be found on their site.
What differentiates ChStack from other cheap domain registration providers is the wonderful multi-action Domain Manager located in their hosting Control Panel, which permits you to register, transfer, lock and unlock and park domain names, to change your WHOIS information, to add custom DNS records, to order Secure Sockets Layer certificates and more. The company behind ChStack is an ICANN-appointed domain name registrar. By all means, there are lots of other differences between ChStack and the rest of the domain name registration service providers, but one of the most significant advantages of ChStack is the fact that you can administer your domains and billing transactions, contact the customer support personnel, etc. using one easy-to-use web hosting Control Panel interface.