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SOLID is five design principles intended to make software designs more understandable, flexible and maintainable.
Single responsibility principle
A class should only have a single responsibility, that is, only changes to one part of the software’s specification should be able to affect the specification of the class.
Software entities … should be open for extension, but closed for modification.
Liskov substitution principle
Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.
Interface segregation principle
Many client-specific interfaces are better than one general-purpose interface.
Dependency inversion principle
One should depend upon abstractions, [not] concretions.
The idea with this pattern is to have a generic abstract way for the app to work with the data layer without being bothered what storage technology is used when saving/retrieving the data.
When reading/writing data, it is RECOMMENDED to wrap it into Repository Object