When one company takes over another company and becomes the new owner in the process, this purchase is called an acquisition.
If you watch the above scene carefully from the movie ‘Secret life of Walter Mitty’, it shows how the company (The Life magazine) is being taken over by the new online division. Legally, the target company ceases to exist. Like in the scene above, they are talking about transition which means how the absorption of the company will take place.
Acquiring company takes the majority stake in the acquired company (LIFE magazine, in this case). Legal structure of the company does not change but management changes and hence there is cutting of staff (downsizing) and new divisions are created.
These changes can be stressful for existing employees as it could mean that they might lose their jobs. To effectively manage this change, management must retain and resort to keeping the most valuable resources with the company.