What is the importance of taking CELTA course and how can we use it to improve our classroom ?

an initial teacher training qualification for teaching English as a second or foreign language (ESL and EFL). It is provided by Cambridge English Language Assessment through authorised Cambridge English Teaching Qualification centres and can be taken either full-time or part-time. CELTA was developed to be suitable both for those interested in Teaching English as a Foreign Language(TEFL) and for Teaching English as a Second Language (TESOL).