In Vygotsky's theory of cognitive development scaffolding means :

'Lev Vygotsky', a Soviet psychologist, has propounded the "Socio-cultural Theory". This theory implies the idea that social interaction plays a crucial role in the development of learners' cognitive ability. 

Key Points

• Scaffolding involves adjusting the amount and type of support based on the learner’s current ability.
• Initially, more help is given (like hints, prompts, or demonstrations), and as the learner gains independence, the support is gradually withdrawn.
• This approach helps the child perform tasks within their Zone of Proximal Development (ZPD)—tasks they cannot yet do alone but can achieve with assistance.

Thus, it is concluded that in Vygotsky's theory of cognitive development scaffolding means changing the level of support.

Additional Information

• More Knowledgeable Others (MKO): According to Vygotsky, MKOs are those people, who are more knowledgeable and have better expertise in a particular domain. These MKOs can help in improving the skill of the children. MKO need not be a person in all instances. 
• Zone of Proximal Development (ZPD): It is the key feature of Vygotsky’s theory. The concept of MKO is closely related to ZPD. According to Vygotsky, ZPD is the difference between the present level of development attained without anyone’s assistance and the potential level of development that can be attained under the guidance of MKO