What are the various keywords used in Cucumber for writing a scenario?

Answer

Gherkin Keywords for Writing Scenarios

Step Keywords (Most Important)

Keyword	Purpose	Example
`Given`	Precondition — sets initial context	`Given the user is on the login page`
`When`	Action — event that triggers behavior	`When the user enters valid credentials`
`Then`	Outcome — expected result / assertion	`Then the dashboard should be displayed`
`And`	Adds another step of the same type	`And the user clicks the Login button`
`But`	Negative continuation	`But the error message should not appear`

Structural Keywords

Keyword	Purpose
`Feature`	Describes the feature being tested
`Scenario`	A single test case
`Scenario Outline`	Parameterized test with multiple data sets
`Background`	Common steps before each scenario
`Examples`	Data table used with Scenario Outline

Complete Example

Gherkin

Feature: Shopping Cart

  Background:
    Given the user is logged in
    And the user is on the product page

  Scenario: Add single item to cart
    When the user clicks "Add to Cart" for "Laptop"
    Then the cart count should show "1"
    And the cart total should be "$999"
    But the checkout button should not be disabled

  Scenario Outline: Add multiple products
    When the user adds "<product>" to the cart
    Then the cart should contain "<product>"
    And the price shown should be "<price>"

    Examples:
      | product  | price  |
      | Laptop   | $999   |
      | Phone    | $599   |
      | Tablet   | $399   |

Tips

✓And / But inherit the type of the preceding step (Given/When/Then)
✓Use And to keep scenarios readable without repeating Given/When/Then
✓Steps should describe business behavior, not implementation details