What are parameterized tests in JUnit 6 and how do you write them?

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.*;

class ParameterizedDemo {

    // @ValueSource: simple single-argument tests
    @ParameterizedTest
    @ValueSource(ints = {1, 2, 3, 4, 5})
    void isPositive(int n) {
        assertTrue(n > 0);
    }

    // @CsvSource: multiple arguments per invocation
    @ParameterizedTest(name = "{index}: add({0}, {1}) = {2}")
    @CsvSource({
        "1, 2, 3",
        "10, 20, 30",
        "-5, 5, 0"
    })
    void additionTest(int a, int b, int expected) {
        assertEquals(expected, a + b);
    }

    // @MethodSource: call a static method returning a Stream
    @ParameterizedTest
    @MethodSource("provideStrings")
    void blankStringsAreRejected(String input) {
        assertThrows(IllegalArgumentException.class,
            () -> new Username(input));
    }

    static Stream<String> provideStrings() {
        return Stream.of("", " ", "  ", null);
    }

    // @EnumSource: test all or selected enum values
    @ParameterizedTest
    @EnumSource(value = Status.class, names = {"PENDING", "PROCESSING"})
    void activeStatusesAreNotFinal(Status s) {
        assertFalse(s.isFinal());
    }

    // @NullSource / @EmptySource / @NullAndEmptySource
    @ParameterizedTest
    @NullAndEmptySource
    void nullAndEmptyAreRejected(String input) {
        assertThrows(IllegalArgumentException.class,
            () -> new Username(input));
    }
}