A postdoctoral position is the expected next step for many graduate students. If you are interested in an academic career, then a postdoc is definitely a necessary rung on the ladder towards academia. Choosing the right postdoc will then be one of the most important decisions for your career and you will need to think about it carefully and with advance time before making the switch. If you are still not sure about your career goals, then a postdoc might afford you additional time to make a decision, but this can come at a cost of time and salary. For these reasons, it is important to inform yourself as soon as possible about what it means to do a postdoc and what to consider when searching for one.