A trust is a legal relationship in which the legal title to property is entrusted to a person or legal entity with a fiduciary duty to hold and use it for another's benefit. In the Anglo-American common law, the party who entrusts the property is known as the "settlor", the party to whom the property is entrusted is known as the "trustee", the party for whose benefit the property is entrusted is known as the "beneficiary", and the entrusted property itself is known as the "corpus" or "trust property". With the strategic and legal use of Trusts, individuals can ensure that their children and grandchildren or chosen beneficiaries are able to benefit completely from the inheritance they want them to receive.

A testamentary trust is created by a will and arises after the death of the settlor. An inter vivos trust is created during the settlor's lifetime by a trust instrument. A trust may be revocable or irrevocable; in the United States, a trust is presumed to be irrevocable unless the instrument or will creating it states it is revocable, except in California, Oklahoma, and Texas, in which trusts are presumed to be revocable unless the instrument or will creating them states they are irrevocable. An irrevocable trust can be "broken" (revoked) only by a judicial proceeding.

The trustee is the legal owner of the property in trust, as fiduciary for the beneficiary or beneficiaries who is/are the equitable owner(s) of the trust property. Trustees thus have a fiduciary duty to manage the trust to the benefit of the equitable owners. They must provide a regular accounting of trust income and expenditures. Trustees may be compensated and be reimbursed their expenses. A court of competent jurisdiction can remove a trustee who breaches his/her fiduciary duty. Some breaches of fiduciary duty can be charged and tried as criminal offences in a court of law.

A trustee can be a natural person, a business entity or a public body. A trust in the United States may be subject to federal and state taxation.

A trust is created by a settlor, who transfers title to some or all of his or her property to a trustee, who then holds title to that property in trust for the benefit of the beneficiaries. The trust is governed by the terms under which it was created. In most jurisdictions, this requires a contractual trust agreement or deed. It is possible for a single individual to assume the role of more than one of these parties, and for multiple individuals to share a single role. For example, in a living trust it is common for the grantor to be both a trustee and a lifetime beneficiary while naming other contingent beneficiaries.