Leaving aside the inevitable, though non-mandatory www, a domain name is made up of two parts: the domain name you have chosen and the TLD (Top Level Domain) or ccTLD (Country Code Top Level Domain).

The second part should, theoretically, characterise either the activity of your site or the country, region or territory from which it originates. In order to help you choose your next domain name, you will find below a table that lists all the thematic TLDs and ccTLDs which exist on the Internet:

.com	Originally for commercial sites.
.net	Originally for sites involved in Internet infrastructure activities.
.org	Originally for non-commercial organisations.
.edu	For American universities.
.gov	For American governmental institutions.
.mil	For American military organisations.
.biz	For businesses.
.info	For information sites .
.name	For individuals.
.museum	For museums.
.aero	For sites relating to the air-transport industry.
.coop	For cooperatives.
.pro	For professions.

.ac	Ascension Island
.ad	Andorra
.ae	United Arab Emirates
.af	Afghanistan
.ag	Antigua and Barbuda
.ai	Anguilla
.al	Albania
.am	Armenia
.an	Netherlands Antilles
.ao	Angola
.aq	Antartica
.ar	Argentina
.as	American Samoa
.at	Austria
.au	Australia
.aw	Aruba
.az	Azerbaijan
.ba	Bosnia-Herzegovina
.bb	Barbados
.bd	Bangladesh
.be	Belgium
.bf	Burkina Faso
.bg	Bulgaria
.bh	Bahrain
.bi	Burundi
.bj	Benin
.bm	Bermuda
.bn	Brunei
.bo	Bolivia
.br	Brazil
.bs	Bahamas
.bt	Bhutan
.bv	Bouvet Island
.bw	Botswana
.by	Belarus
.bz	Belize
.ca	Canada
.cc	Cocos (Keeling) Islands
.cd	Democratic Republic of Congo
.cf	Central African Republic
.cg	Republic of Congo
.ch	Switzerland
.ci	Cote d'Ivoire
.ck	Cooks Islands
.cl	Chile
.cm	Cameroon
.cn	China
.co	Colombia
.cr	Costa Rica
.cu	Cuba
.cv	Cap Verde
.cx	Christmas Island
.cy	Cyprus
.cz	Czech Republic
.de	Germany
.dj	Djibouti
.dk	Denmark
.dm	Dominica
.do	Dominican Republic
.dz	Algeria
.ec	Ecuador
.ee	Estonia
.eg	Egypt
.eh	Western Sahara
.er	Eritrea
.es	Spain
.et	Ethiopia
.fi	Finland
.fj	Fiji
.fk	Falkland Islands
.fm	Federal State of Micronesia
.fo	Faroe Islands
.fr	France
.ga	Gabon
.gd	Grenada
.ge	Georgia
.gf	French Guiana
.gg	Guernsey
.gh	Ghana
.gi	Gibraltar
.gl	Greenland
.gm	Gambia
.gn	Guinea
.gp	Guadeloupe
.gq	Equatorial Guinea
.gr	Greece
.gs	South Georgia and the South Sandwich Islands
.gt	Guatemala
.gu	Guam
.gw	Guinea-Bissau
.gy	Guyana
.hk	Hong Kong
.hm	Heard and McDonald Islands
.hn	Honduras
.hr	Croatia/Hrvatska
.ht	Haiti
.hu	Hungary
.id	Indonesia
.ie	Ireland
.il	Israel
.im	Isle of Man
.in	India
.io	British Indian Ocean Territory
.iq	Iraq
.ir	Islamic Republic of Iran
.is	Iceland
.it	Italy
.je	Jersey
.jm	Jamaica
.jo	Jordan
.jp	Japan
.ke	Kenya
.kg	Kyrgyzstan
.kh	Cambodia
.ki	Kiribati
.km	Comoros
.kn	Saint Kitts and Nevis
.kp	Democratic People's Republic of Korea
.kr	Republic of Korea
.kw	Kuwait
.ky	Cayman Islands
.kz	Kazakhstan
.la	Lao People's Democratic Republic
.lb	Lebanon
.lc	Saint Lucia
.li	Liechtenstein
.lk	Sri Lanka
.lr	Liberia
.ls	Lesotho
.lt	Lithuania
.lu	Luxembourg
.lv	Latvia
.ly	Libyan
.ma	Morocco
.mc	Monaco
.md	Moldova
.mg	Madagascar
.mh	Marshall Islands
.mk	Macedonia
.ml	Mali
.mm	Myanmar (Birmania)
.mn	Mongolia
.mo	Macau
.mp	Northern Mariana Islands
.mq	Martinique
.mr	Mauritania
.ms	Montserrat
.mt	Malta and Gozo
.mu	Mauritania
.mv	Maldives
.mw	Malawi
.mx	Mexico
.my	Malaysia
.mz	Mozambique
.na	Namibia
.nc	New Caledonia
.ne	Niger
.nf	Norfolk Island
.ng	Nigeria
.ni	Nicaragua
.nl	Netherlands
.no	Norway
.np	Nepal
.nr	Nauru
.nu	Niue
.nz	New Zealand
.om	Oman
.pa	Panama
.pe	Peru
.pf	French Polynesia
.pg	Papua New Guinea
.ph	Philippines
.pk	Pakistan
.pl	Poland
.pm	St. Pierre and Miquelon
.pn	Pitcairn
.pr	Puerto Rico
.ps	Palestinian Territories
.pt	Portugal
.pw	Palau
.py	Paraguay
.qa	Qatar
.re	Reunion Island
.ro	Romania
.ru	Russian Federation
.rw	Rwanda
.sa	Saudi Arabia
.sb	Solomon Islands
.sc	Seychelles
.sd	Sudan
.se	Sweden
.sg	Singapore
.sh	St. Helena
.si	Slovenia
.sj	Svalbard and Jan Mayen Islands
.sk	Slovak Republic
.sl	Sierra Leone
.sm	San Marino
.sn	Senegal
.so	Somalia
.sr	Suriname
.st	Sao Tome and Principe
.su	Former Soviet-Union
.sv	El Salvador
.sy	Syrian Arab Republic
.sz	Swaziland
.tc	Turks and Caicos Islands
.td	Chad
.tf	French Southern Territories
.tg	Togo
.th	Thailand
.tj	Tajikistan
.tk	Tokelau
.tm	Turkmenistan
.tn	Tunisia
.to	Tonga
.tp	East Timor
.tr	Turkey
.tt	Trinidad and Tobago
.tv	Tuvalu
.tw	Taiwan
.tz	Tanzania
.ua	Ukraine
.ug	Uganda
.uk	United Kingdom
.um	US Minor Outlying Islands
.us	United States
.uy	Uruguay
.uz	Uzbekistan
.va	City Vatican State
.vc	Saint Vincent and the Grenadines
.ve	Venezuela
.vg	Virgin Islands (British)
.vi	Virgin Islands (USA)
.vn	Vietnam
.vu	Vanuatu
.wf	Wallis and Futuna
.ws	Western Samoa
.ye	Yemen
.yt	Mayotte
.yu	Yugoslavia
.za	South Africa
.zm	Zambia
.zr	Zaire
.zw	Zimbabwe