Custom list building is the process of creating targeted lists for a specific marketing campaign or audience. This can include gathering contact information, segmenting demographics, and identifying potential leads based on interests and behavior. Using custom list building, businesses are able to tailor their outreach and messaging in order to create more personalized and effective campaigns. This strategy can result in higher conversion rates and an improved ROI.

-Database marketing: This type of Custom List Building uses customer data that has been collected over time in order to create marketing lists. This data can come from a variety of sources, including surveys, customer loyalty programs, and transaction histories.

-List brokers: These companies specialize in compiling marketing lists from a variety of sources. They then sell these lists to businesses who want to reach a specific target audience.

-Direct marketing: This type of Custom List Building involves contacting potential customers directly, either by phone or mail. businesses will usually purchase marketing lists from list brokers for this purpose.

-Web scraping: This method involves using software to automatically extract data from websites. This data can then be used to create marketing lists. This is a more controversial method of Custom List Building, as it can be seen as intrusive and unethical by some people.