I am from the UK.

Would like to promote my website in other countries... will using a .com be OK? or should I register domains using the correct extensions for each country I am targeting i.e France, fr etc; etc;

Basically I am trying to find out if .com is used world-wide or just mainly for usa and uk companies.

Will having .com look professional in other countries.

Thanks for your help.

yes dot com and dot net are used all around the world! where name.co.uk is mostly for local countrys.

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den's domain

Just like .com, .net and .org, ccTLDs are universally recognized and work just like other domain extensions
all over the world can use .com domain name