Elon Musk and Twitter are to face off in Delaware Chancery Court starting Oct. 17, as the social-media company seeks to force the billionaire to complete his $44 billion takeover. The two sides have spent recent weeks seeking information to buttress their respective positions, sometimes appealing to the judge to make the other party comply with their demands. Here is what to know:

Why are Mr. Musk and Twitter fighting in court?

Mr. Musk gave notice on July 8 that he wanted out of the deal, arguing that Twitter hadn’t provided the necessary data and information to assess the prevalence of fake or spam accounts on the platform. Days later, the social-media company sued Mr. Musk to enforce the deal at the earlier agreed-upon terms.