Estate planning is the overall big picture strategy. Every estate plan consists of interlocking documents.
Trusts are legal entities created for a specific purpose or goal and funded with specific assets.
A will is the basic foundation for all estate plans, everyone should have one. Even extremely complicated estate plans have a will component.
Probate is the legal process of providing legal authority for an individual to act on behalf of an estate, while also providing a forum to resolve disputes arising from the administration of an estate.