Hurray! The first hurdle has been cleared: your own application was so convincing that it stood out so positively from the mass of submissions that you are now personally invited for an interview. Now it is important to convey the written impression convincingly in person.
Usually you only have one chance to introduce yourself personally. In large companies the interview takes place in the personnel department, in smaller companies also directly with the managing director.
Job interviews usually follow a certain structure for which one can prepare oneself. For preparation it is good to remember again: why do I want this job? Why do I want it with exactly this company/organisation? What talents do I bring to the job? But also: which weaknesses do I have – and why are they not so important?