Sweeteners provide a sweet taste without the calories and effect on blood sugar levels that table sugar has. The sweetener market is big and it's almost as easy to find sweeteners in your local supermarket as it is to find sugar.
Sweeteners are quite versatile. You can use them in a mug of tea or coffee and can even use them in baking to some extent. For baking, you may want to check the sweetener's website for baking tips and guidance on how much to use in place of sugar.
For some baking tasks, such as caramelising, it may not be possible to use sweeteners however.
The two main types are artificial sweeteners and sugar alcohols. Stevia-based sweeteners were approved for sale in Europe in 2011.
Sweeteners: http://www.diabetes.co.uk/diabetes_ca...