The term 'apprentice' has existed for hundreds of years to describe someone who is 'bound' to an employer who then teaches them a trade or profession.
When you become an Apprentice in the modern sense, you sign a contract that binds you to your new employer for a set period of time. In return your employer signs a contract promising to employ and train you for that period.
The training takes place within a 'Framework' that states the minimum qualifications that you will get, although there are variations to ensure the training is tailor made to suite your needs.
Remember the better qualified you are, the more money you will be able to earn in later life.
You can also get advice from the Institute for Apprenticeships web site at www.instituteforapprenticeships.org