Honestly, 99% of English speakers don't use the word "whom."

Hi Yasir, "Whom" is used when we are focusing on someone as the object of a verb in the beginning of a sentence. (In turn, an object of a verb is a someone or something that receives an action.) Examples: The man whom Jane asked a question is a teacher. Notice that "The man" received an action from Jane, hence he is the object. "Jane" is the subject as she is the person who did the action. "is a teacher" ends the sentence by providing more details about the object. The person whom we gave the money is a scammer. Again, the focus in the beginning of the sentence is on the object, and we use "whom" to indicate this focus. "Whom" is also often used to describe the recipient of something. Examples: To whom do I call? (focusing on the person who will receive your call) For whom did you buy a present? (focusing on the person who received your present) Hope this helps. Lance

In terms of grammar, the explanation which @Mr Lance has given you is 100% correct. In fact, I'm frequently impressed by how how accurate and carefully prepared Mr Lance's grammatical explanations are. Of the numerous upvotes he receives, many are from me. He has an excellent understanding of grammar, and I am sure that he is a fine teacher. However, Jenna's assessment of the situation is also accurate : most native speakers very rarely use 'whom', and the vast majority have never uttered this word in their entire lives. We certainly don't use it in everyday conversation about scammers. So, although Mr Lance's examples are grammatically sound, they are also, unfortunately, completely inauthentic. No native speaker would ever say "To whom do I call?" , and the question "For whom did you buy a present?" sounds like something from a grammar book published in the 1950s! These examples are simply not accurate reflections of native-speaker English. This is not how we use language. Unless you need to write formal legal documents as part of your job, you can get through life perfectly well without ever using the word 'whom'. There are far more important aspects of the English language for you to concentrate on.