technisch
technical
Relates to technology, the way devices, machines, or processes work.
Das Gerät hat einen technischen Defekt.
The device has a technical defect.

technical
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technical
Relates to technology, the way devices, machines, or processes work.
Das Gerät hat einen technischen Defekt.
The device has a technical defect.

The adjective 'technisch' (technical) is derived from the noun 'die Technik' (technology/technique). The ending '-isch' is a typical way to form an adjective from a noun.
Die technische Entwicklung der letzten Jahre ist beeindruckend.
The technical development of recent years is impressive.
You can recognize the meaning of 'technisch' (technical) from the context. If it is about devices or machines, it refers to how something works. In the context of sports or art, it refers to skill. If a sentence begins with 'technisch gesehen' (technically speaking), the formal, theoretical meaning is intended.
Die Anlage hat ein technisches Problem.
The system has a technical problem.
When it is about devices and machines, 'technisch' (technical) is often used in fixed combinations, e.g. 'technische Daten' (technical specifications), 'technische Unterstützung' (technical support), or 'ein technischer Fehler' (a technical error).
Für technische Unterstützung rufen Sie bitte unsere Hotline an.
For technical support, please call our hotline.
To describe skills in sports or art, 'technisch' (technical/technically) is often combined with adverbs or adjectives such as 'versiert' (skilled), 'brillant' (brilliant), or 'sauber' (clean/precise).
Die Eiskunstläuferin zeigte eine technisch perfekte Kür.
The figure skater performed a technically perfect free skate.
The phrase 'technisch gesehen' (technically speaking) is often used at the beginning of a sentence to introduce a formal or theoretical perspective. It means roughly the same as 'streng genommen' (strictly speaking).
Technisch gesehen ist das Meeting noch nicht vorbei, aber alle sind schon gegangen.
Technically speaking, the meeting isn't over yet, but everyone has already left.
practical / virtually
'technisch' and 'praktisch' can both describe how something works or is used. The difference lies in the point of view: 'technisch' asks about devices, processes, or the exact way something functions. 'praktisch' is more about whether something is useful in everyday life or works in actual use. They can be confused because, when there are problems, people often consider both aspects. A simple guide is: 'technisch' fits the machine or method, while 'praktisch' fits use in real life.

Das neue Gerät ist technisch sehr modern, aber schwer zu bedienen.
The new device is technically very modern, but difficult to use.
Für die Reise ist ein kleiner Rucksack praktischer als ein großer Koffer.
For the trip, a small backpack is more practical than a large suitcase.