Typically there is a grace period during which the registrant can still buy the domain back without paying additional fees, but the length of it varies from registrar to registrar. It could be as short as a week or two, as long as a year, or not offered at all (although reputable registrars offer a grace period). The length of the grace period also depends on the kind of top-level domain (.com, .org, .net, etc.) used.

*Domain squatting, or cybersquatting, refers to registrants who register domain names before other people or organizations that want them have a chance to do so, often in violation of trademarks. Cybersquatters sometimes will attempt to extort money from those who should rightfully own the domain. Domain squatting is different from domain parking, which is when someone registers a domain they are not actively using without attempting to sell it to someone else.
Searching for a suitable domain name for your website can be quite trying. The reason for this is that the names that you want to get have already been assigned and are not available. As an SEO you know the importance of getting a domain name that describes your business as closely as possible. For example, if you are running a car rental service, you will look for a domain name that has the words ‘car’ and ‘rental’ in it. So if you can’t find a suitable name, you could use the expired domains tool which might show you domain names that would meet your requirements.

Sir I am a newbie and a lot interested in doing this business but I don’t know fron where and how to start it. How to purchase where I have to pay and how I have to pay all sort of questions are there in my mind. So sir if you could email me the details then it would be of great help. Its been months searching but I hadn’t purchased any domain yet.
Yes, we port in all of the domains from NameJet, SnapNames, etc. There are a lot of great deals to be found. Some are absolute trash of course but if you can sift through them and put some time in (hopefully that is what we are trying to do with our tools is save time and give some value add with the SEO metrics, alerts, etc.) then you can find some great bargains.
This wonderful piece of information about buying expired domains is simply mind-blowing and I did not know about that before. It is easy for every one to understand about the topic with the pictorial representation. I feel sad that you lost around $400 due to Fake PR, but this article will surely help others save them from any sort of inconvenience.
The following TLDs are now fully supported with a deleted list and a droplist (pending delete list). .hn, .ht, .rw, .cr, .gl, .gy, .gs, .om, .qa, .ir, .pe, .com.pe, .tc, .ky, .th, .co.th, .ke, .co.ke, .uz, .kz, .pm, .re, .tf, .wf, .yt, .sx, .gd, .gi, .kg, .mu, .im, .ug, .sb, .tl, .st, .sm, .so, .sn, .pf, .nyc, .cloud, link, .ms, .mk, .af, .bi, .pr, .com.pr, .nf, .nc, .dm, .bo, .ki, .iq, .bj, .am, .as, .ax, .fo, .mg