Teaching is defined as

Teaching is a process related to the effective transmission of knowledge and skills in an individual. It limits or enhances the ways the learners learn and assimilate concepts and ideas.

Teaching is defined as 'facilitation of learning' or in other words, the main objective of teaching is to facilitate learning:

• Traditionally, teachers are the ones with knowledge and expertise in a particular field. They impart that knowledge through a variety of means to their students. 
• Facilitators build on the knowledge base of the group of students to find the answers to questions.
•  A facilitator is a person who assists a group of people in grasping at their common targets and in achieving them without any intervention on his/her behalf.
• Therefore, when we say the teacher has to play the role of a facilitator in the classroom, this means that the teacher should not be the king who controls the activities of the learners.
• He /she should grant the learners some space to let the spirits of creativity and innovation.
• In other words, the learners must get involved in active participation that would be represented in argumentative discussions and teamwork activities, so that the process of learning becomes comprehensive.

Hence, it could be concluded that teaching is defined as 'facilitation of learning'.