It is important for expatriates to maintain a sense of their own national identity, which can be achieved by continuing with traditions and celebrating important occasions wherever in the world they happen to be.
This is why expats of Welsh origin will be marking St David's Day today, although some may be doing it in an unconventional manner.
In Wales itself, people don the traditional dress, eat Welsh cakes and display daffodils, but this cannot always be achieved when abroad.
Aled William, from Graigwen in Pontypridd, now lives in California with his wife Rosie and the pair always try and make an effort on March 1st.
He told the BBC: "I'll be wearing my Pontypridd RFC kit from dawn to dusk: it's surprising how many people have never heard of them seeing as they are the greatest sporting team in the history of the earth."
Meanwhile Sharon Flint from Port Talbot is in Lesotho as part of a volunteer teaching programme with a number of others from Wales.
She said: "This St David's Day all our schools are getting together for a traditional dance competition so it is a perfect opportunity for us to wave our Welsh flags and teach them some Welsh songs, dancing and maybe even a bit of tag rugby."
Across the world in China, another teacher, Emma Owen from Pontypridd, will encourage the children she teaches to dress in red and make Welsh flags with them.
She will also tell them the story of St David and his significance to the people of Wales, so far away.
Sara Hinds, who is originally from Penarth, but now lives in Australia, said that she intended to take a different approach to celebrating the culture of her homeland.
She said: "We've been having a rather extreme version of Welsh weather lately so I hadn't given Dydd Dewi Sant much thought so far. But it is on Friday, which has to be an excuse for something.
"Perhaps another viewing of Gavin and Stacey? Or Sherlock, Torchwood, Doctor Who or even maybe Casualty?"