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1. What is a Lightning Web Component (LWC)?<\/strong> <\/p>\n Lightning Web Component is a Salesforce programming model that leverages modern web standards to develop components for the Salesforce Lightning Platform.<\/p>\n 2. What are the key features of Lightning Web Components?<\/strong> <\/p>\n Key features include reusability, encapsulation, performance optimization, and compatibility with modern web standards.<\/p>\n 3. How do you pass data from a parent component to a child component in LWC?<\/strong> <\/p>\n You can pass data from a parent to a child component using properties, which are annotated with the 4. How can you handle events in LWC?<\/strong> <\/p>\n You can handle events using the 5. What is the purpose of the The 6. What is the role of the Lightning Data Service (LDS) in LWC?<\/strong> <\/p>\n Lightning Data Service provides a standard way to access and manipulate Salesforce data in Lightning Components, including LWC.<\/p>\n 7. How do you make an HTTP callout from a Lightning Web Component?<\/strong> <\/p>\n You can use the 8. What is the use of the The 9. How do you handle errors in Lightning Web Components?<\/strong><\/p>\n You can use the 10. What is the difference between 11. Explain the concept of shadow DOM in LWC.<\/strong> <\/p>\n Shadow DOM is a web standard that encapsulates a component\u2019s styles and structure, preventing CSS conflicts with other components on the page.<\/p>\n 12. What is the role of the The 13. How do you handle user interactions in LWC?<\/strong> <\/p>\n You can use event handlers in the template to listen to user interactions, such as clicks or inputs, and call methods in the component\u2019s JavaScript.<\/p>\n 14. What is the purpose of the The 15. What is the difference between imperative and reactive Apex methods in LWC?<\/strong><\/p>\n Imperative methods use 16. How can you make a Lightning Web Component available for use in the Salesforce App Builder?<\/strong> You need to define a custom component in the 17. What is the purpose of the 18. How can you communicate between sibling components in LWC?<\/strong> <\/p>\n You can use custom events and properties defined in a common parent component to facilitate communication between sibling components.<\/p>\n 19. What is the role of the The 20. How do you unit test a Lightning Web Component?<\/strong> <\/p>\n You can write unit tests for LWC using Jest framework, which is supported by Salesforce. Test components, properties, and methods using Jest functions.<\/p>\n<\/p><\/div>\n@api<\/code> decorator in the child component.<\/p>\n@wire<\/code> decorator, which binds a component\u2019s property to a value from an Apex method.<\/p>\n@wire<\/code> decorator in LWC?<\/strong> <\/p>\n@wire<\/code> decorator is used to wire a component\u2019s property to a data source, such as an Apex method or a field on a record.<\/p>\nfetch<\/code> API to make HTTP callouts in LWC. Import the fetch<\/code> method and use it to send requests to external services.<\/p>\n@track<\/code> decorator in LWC?<\/strong><\/p>\n@track<\/code> decorator is used to track changes to properties so that the component can rerender when those properties change.<\/p>\ntry<\/code>\u2013catch<\/code> block to catch errors and handle them gracefully. Additionally, you can display error messages to users.<\/p>\nlightning-card<\/code> and lightning-layout<\/code> components in LWC?<\/strong> lightning-card<\/code> provides a styled container for content, while lightning-layout<\/code> is used for creating layouts with multiple regions.<\/p>\nwire<\/code> service in LWC?<\/strong> <\/p>\nwire<\/code> service is a module that provides reactive data binding, allowing you to get and update data from a data source without needing to write boilerplate code.<\/p>\napi<\/code> property in LWC?<\/strong> <\/p>\napi<\/code> property allows you to expose properties and methods in a Lightning Web Component that can be used by parent components or by external code.<\/p>\n@wire<\/code> to fetch data when needed, while reactive methods use the @wire<\/code> service to automatically update data when it changes.<\/p>\nmeta.xml<\/code> file of your LWC and set the isExposed<\/code> attribute to true<\/code>.<\/p>\nlightning-record-edit-form<\/code> component in LWC?<\/strong> <\/p>\nlightning-record-edit-form<\/code> is used to create, view, or edit a record\u2019s fields using the Salesforce Lightning Data Service.<\/p>\nlightning\/navigation<\/code> module in LWC?<\/strong> <\/p>\nlightning\/navigation<\/code> module allows you to navigate users to different pages within Salesforce, such as records, lists, or custom pages.<\/p>\n