Yes, it will help to increase Audience engagement.

There are so many technologies available, like if we talk about PHP frameworks then depending on the business requirements some of the important PHP frameworks for ecommerce development are - WordPress, Shopify, ExpressionEngine, CraftCMS, and Magento and so on... Even ASP .Net is also a Good idea to implement ecommerce projects.

Yes of course, even in many websites the chatbots are doing their work easily.