Salesforce is a cloud-based CRM tool that has evolved from its original purpose of tracking sales-related data to help users conduct various activities such as creating and executing campaigns for marketing tactics like email, social media, search engine marketing, and telemarketing. To create an email marketing campaign, users need to add the Campaigns tab to their Salesforce home screen, select "New Campaign", enter key details, associate specific contacts with the campaign, execute the campaign activities such as sending emails, track the results and activities within the Campaign tab, and analyze the impact of the campaign on sales opportunities. By creating, executing, and tracking campaigns through Salesforce, users can streamline the process of turning targeted individuals into warm leads, opportunities, and closed sales, while also gaining a more holistic view of each contact, lead, and account within the platform.