SAMR shows a progression teachers may go through when integrating technology.When integrating technology and looking at these levels it is important to keep in mind the level of student engagement.
Substitution - Using Google Docs instead of Microsoft Word for writing a paper. Same task different tools.
Augmentation - Though it is a different level, but we are still in the substitution mentality but this time with added functionalities. Again using the example of Google docs, instead of only writing a document and having to manually save it and share it with others, Google Docs provides extra services like auto saving, auto syncing, and auto sharing in the cloud.
Modification - This is the level where technology is being used more effectively not to do the same task using different tools but to redesign new parts of the task and transform students learning. An example of this is using the commenting service in Google Docs, for instance, to collaborate and share feedback on a given task task.
Redefinition - Redefinition means that students use technology to create imperceptibly new tasks. As is shown in the video below an example of redefinition is "when students connect to a classroom across the world where they would each write a narrative of the same historical event using the chat and comment section to discuss the differences, and they use the voice comments to discuss the differences they noticed and then embed this in the class website".
Text from Educational Technology & Mobile Learning
More resources on SAMR Model: