Yes, it is plagiarism.
Step-by-step explanation:
Plagiarism means stealing or copying others work and showing it as one’s own work. It is also known as commitment of literary theft. Changing or editing someone’s work without mentioning them or giving credit to them.
Plagiarism can be avoided by mentioning the source where the content is copied or borrowed. The required information can be given to the followers regarding the content source.
Each information and content is protected by copyright laws. So misusing the content without the knowledge of the source person can lead to serious problem.