This is one very common type of visual data that you may be given. The video below gives a full explanation of how to apply our 6 step writing process for IELTS Academic Writing Task 1 to questions with process diagrams.
There is also an example process diagram question and model answer for you to see how an answer looks if you follow our process correctly, located underneath the video. The video shows you exactly what to write for each sentence in order to get a band 7+ in IELTS process diagram questions.