这篇文章有详细介绍，链接：
https://www.wengbi.com/thread_77267_1.html
一般来说，RSU分四年平均分配, 如果员工中途离职，那么未被分配的RSU就自动作废。
Stock Option，期权有很多种，市场上公开交易的期权和公司期权也有不少区别，但是本质都是以固定价格购买（卖出）股票的权利。
https://www.investopedia.com/terms/r/restricted-stock-unit.asp
What Is a Restricted Stock Unit (RSU)?
A restricted stock unit (RSU) is compensation issued by an employer to an employee in the form of company stock. Restricted stock units are issued to an employee through a vesting plan and distribution schedule after achieving required performance milestones or upon remaining with their employer for a particular length of time. RSUs give an employee interest in company stock but they have no tangible value until vesting is complete. The restricted stock units are assigned a fair market value when they vest. Upon vesting, they are considered income, and a portion of the shares is withheld to pay income taxes. The employee receives the remaining shares and can sell them at his or her discretion.
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