IELTS Academic Writing Task 1 is different than for the General IELTS test. Candidates need to summarise visual data into a minimum of 150 words.
The visual data may appear as any of the following: line graphs, bar charts, pie charts, tables, maps, or flow diagrams. Sometimes you may have more than one of these to summarise.
It is recommended that you spend 20 minutes on task 1 which leaves you with 40 mins to complete the essay task afterwards.