A more thorough explanation:

Definition: Agreement, approval, or permission; especially, verbal or nonverbal conduct that is reasonably interpreted as willingness.

Examples:

• Actual assent: Assent given by words or conduct intended to express willingness. For example, signing a contract or saying "yes" to an offer.
• Apparent assent: Assent given by language or conduct that, while not necessarily intended to express willingness, would be understood by a reasonable person to be so intended and is actually so understood. For example, nodding your head in agreement.
• Constructive assent: Assent imputed to someone based on conduct. For example, if someone continues to use a service after being notified of changes to the terms and conditions, their conduct may be interpreted as assent to the changes.
• Express assent: Assent clearly and unmistakably communicated. For example, saying "I agree" or "I consent."
• Implied assent: Assent inferred from one's conduct rather than from direct expression. For example, if someone continues to use a service without objection, their conduct may be interpreted as assent to the terms and conditions.
• Mutual assent: Agreement by both parties to a contract, usually in the form of offer and acceptance. In modern contract law, mutual assent is determined by an objective standard - that is, by the apparent intention of the parties as manifested by their actions.

Explanation: Assent refers to agreement, approval, or permission. It can be given through words or conduct that reasonably indicate a willingness to agree. The different types of assent refer to how it is given - whether through direct expression, inferred from conduct, or imputed based on circumstances. Understanding the different types of assent is important in contract law, where mutual assent is necessary for a binding agreement to be formed.