IELTS writing Task 1 is different for the IELTS General test and IELTS Academic test. In the general exam you need to write a letter such as an invitation to a friend, a complaint, an apology, making an arrangement, an application or something informative like a newsletter.
The IELTS academic exam writing task 1 consists of 6 types of charts such as process diagrams, maps, bar charts, pie charts, tables or line graphs. You will need to write a report about one of these, but remember it is very different to writing task 2, it is not an ‘essay’ it is a factual report.
In academic task 1 there must be an overview and a factual description of the main parts of the task, no opinion is given and do not write a conclusion for this type of task. This part of the test is worth one third of your marks for the writing section, writing task 2 is worth much more in marks.