A question mark is used in place of a period at the end of a question. It is easy to forget to use one, especially in longer questions. For example:
Would you be able to send me a list of attendees, any presentation materials, key objectives, and any other relevant information. [missing question mark]
What is your name? [easier to remember]
A question mark is not required when a question asked by another person is being reported. For example:
His boss asked him if he cared about his job.
Although, if the question is quoted, a question mark is required inside the quotes. For example:
His boss asked, “Do you care about your job?”