The best way is to skip the jargon and talk about what the numbers mean in plain terms. Instead of saying "your CTR is 3.2 percent," say "out of every 100 people who saw your ad, about 3 clicked it." Focus on what they care about most, which is usually how many leads or sales came in and what each one cost. Relate everything back to their business goals. Clients understand money better than metrics. How do you usually break down results for clients who are new to this?