What type of transition helps to summarize previously stated information?

The function of certain transition words is to aid in connecting thoughts and ideas within a piece of writing, and "In summary" is specifically designed for this purpose. When you use "In summary," you signal to the reader that you are about to encapsulate or reiterate the main points or information that have previously been discussed. This transition provides clarity by creating a concise overview, making it easier for the reader to grasp the core message before moving on to the next section.

Other transitions, while serving valuable roles in writing, have different functions. For example, "For instance" introduces an example that elaborates on an idea, "Likewise" suggests a continuation or similarity between two points rather than summarizing, and "Firstly" indicates the beginning of a sequence or list rather than a recap. Therefore, "In summary" stands out as the most appropriate choice for summarizing previously stated information.