Isolation for Zero Trust phishing protection is crucial because phishing sites often evade web and email filters, which fail to detect or categorize new phishing websites accurately. Menlo Labs reports that web and email gateways mistakenly classify 10-15 percent of malicious websites as safe, making Internet isolation a perfect solution. By isolating all web traffic, organizations can eliminate the need to anticipate countless daily threats. Despite its effectiveness, isolation is not yet widely considered a core part of the zero trust model, which is a mistake. Zero trust consists of five guiding principles: assuming the network is always dangerous, recognizing that threats can be internal or external, not automatically trusting actors inside the network, authenticating and authorizing every device, user, and network flow, and ensuring policies are dynamic and data-driven. Phishing is the most common attack vector, often succeeding when malicious sites evade filters and users unknowingly enter their credentials. Cloud-based Internet isolation enhances zero trust by creating a virtual container that can limit or terminate connections, thus preventing credential theft and eliminating the need for trust between host machines and the Internet.