Customer Relationship Management
Figure 1: Customer Relationship Management

CRM is Customer Relationship Management

Characteristics of CRM

Customer Service
Figure 2:
Customer Service

Importance of CRM in B2B

CRM in Social Media

CRM in Social Media
Figure 3:
CRM in Social Media

CCRM

CCRM
Figure 4: CCRM

CRMs in Business

Today, there are many CRMs in market. Some of the common CRMs include Salesforce CRM, Oracle CX, Microsoft Dynamic CRM, SugarCRM, and SAP AG. Here is a list of CRMs with their feature comparison:
https://en.wikipedia.org/wiki/Comparison_of_CRM_systems
Summary

This was an overview of CRM. These days almost every business need a CRM and as developers, we must know what a CRM is.