Guerilla marketing relies on low budgets and unconventional promotions to target consumers in unexpected places. It uses time, energy, creativity and grassroots tactics over big advertising spends. Examples include giving away products in public, stunts to grab attention, and using mobile and social media to engage customers. Guerilla marketers focus on human psychology, relationships and cooperation over sales, competition and large product lines. While low-cost, it also carries risks like unclear results and potential legal issues if not done carefully within local laws.