The four basic tools for e-business are: eCommerce Platform: This is the digital equivalent of a physical store. It's where consumers go to browse, select, and purchase goods or services. Email Marketing Software: This tool is used for sending promotional emails to customers, maintaining relationships, providing after-sales service, and retargeting shoppers who've shown interest in your products. Social Media Advertising: eCommerce businesses use social media platforms to engage with customers, advertise products, and manage their brand's online reputation. Online Payment Systems: These tools securely process customer payments. Payment gateways, digital wallets, and other online payment systems fall into this category.