"Neutral" isn't a molecular-level concept. A neutral mutation is one that doesn't affect the fitness of the organism; fitness is depending on the environment. For instance, a mutation that's neutral when nutrients are plentiful might become positive or negative if a particular nutrient becomes rare.

A neutral mutation would be something such as having one green eye and one blue eye. It doesn't hinder you and it doesn't give you an advantage.

A mutation does not affect an organism trait for a reason. It is neutral which depends on the environment.

A neutral mutation is a mutation that has no effect on the body. It is an alteration in the DNA sequence that is neither beneficial nor detrimental to an organism's ability to survive and procreate.

A point shift mutation is more likely to produce a neutral reaction. This is because it involves a change in one nucleotide. A frame shift mutation is more deleterious because it involves the insertion or deletion of multiple base pairs within a gene's coding sequence.