Jest provides many built-in matchers for different assertion types:

Equality matchers:

• toBe(): Exact equality (Object.is)
• toEqual(): Deep equality
• toStrictEqual(): Strict deep equality

Truthiness matchers:

• toBeTruthy(): Truthy values
• toBeFalsy(): Falsy values
• toBeNull(): Specifically null
• toBeUndefined(): Specifically undefined

Number matchers:

• toBeGreaterThan(): Greater than
• toBeCloseTo(): Floating point numbers

String matchers:

• toMatch(): Regular expressions
• toContain(): Substring matching

Array/Object matchers:

• toContain(): Array contains item
• toHaveProperty(): Object has property