Acquisition in digital marketing refers to the process of gaining new customers or clients to grow your business.

1. Search Engine Optimization (SEO): This involves optimizing your website to rank higher in search engine results pages, thereby increasing the quantity and quality of your website traffic.
2. Content Marketing: Creating valuable, relevant content that attracts, engages, and acquires your target audience. This could be through blog posts, videos, infographics, etc.
3. Social Media Marketing: Using social media platforms to promote your products or services, engage with your audience, and build your brand.
4. Email Marketing: Sending emails to potential customers to encourage them to do business with you. This could involve newsletters, promotional emails, and personalized offers.
5. Pay-Per-Click Advertising (PPC): This involves running ads on platforms like Google AdWords or Bing Ads and paying a fee every time someone clicks on your ad.
6. Affiliate Marketing: This involves partnering with other businesses who will promote your product or service in exchange for a commission on any sales they generate.

Remember, the key to successful acquisition in digital marketing is to understand your target audience and create a strategy that caters to their needs and interests.

For further discussion about the acquisition philosophy:

1. Attention: The first task in advertising is to capture the audience’s attention. Without this, you’re simply wasting your budget.
2. Quality Related Content: After capturing their attention, your content must stand out from thousands of competitor ads. It should match your target audience, and you should relate your product to unique, quality content.
3. Branding: Hook your potential audience with quality content and create your brand to differentiate from competitors. This is why they should choose you over others.