One reason is that employers want to check how well you can talk and explain things. Communication is really important in most jobs, but you can't really see that just by looking at someone's resume. In an interview, you have to answer questions and talk about yourself, so it's a good way for them to see if you can communicate clearly.
一个原因是雇主想要了解你表达和解释事情的能力。在大多数工作中,沟通非常重要,但你无法仅仅通过查看简历就了解这一点。在面试中,你需要回答问题并谈论自己,所以这是他们判断你是否能够清晰沟通的一个好方法。