"Estate" is the legal term for everything you own. This includes everything owned by you individually, but also anything jointly owned with a partner or spouse. If you have a partner or spouse, it is advantageous to perform estate planning for both parties at the same time, since much of the information will be similar.
Estate Planning is how YOU can specify what will happen with your estate when you leave this earth. If you do not plan your estate, the state will determine your heirs and estate settlement will be more expensive, more time consuming, and less likely to follow your wishes.