A book of business refers to the collection of accounts, clients, or customers managed by a sales representative, financial advisor, or account manager. It includes active and past clients, their purchase history, preferences, and ongoing deals. Maintaining a strong book of business is crucial for revenue generation and long-term client relationships. CRM systems help sales professionals manage their book of business by tracking interactions, setting follow-up reminders, and analyzing account performance. Successful management involves nurturing existing clients while identifying new opportunities for growth. A well-maintained book of business ensures customer retention and sustainable business growth.