Which ICT resources most directly help in understanding complex linguistic…

Concept. ICT resources are grouped by the instructional function they perform: communication tools carry exchanges between people, productivity tools compose and format documents, reference tools resolve the spelling and meaning of single words, and representational tools — simulations, animations, audio-video material and virtual laboratories — turn an abstract process into a visible, manipulable model. A linguistic concept counts as complex when the process behind it (articulation, sound change, word formation, sentence structure) cannot be observed directly, so building understanding of it needs a resource that makes that hidden process perceptible and lets the learner act on it.

Application. Take concepts such as place and manner of articulation, phoneme–grapheme correspondence, or the internal structure of a sentence:

1. An animated vocal-tract simulation shows the tongue, lip and airflow positions for each sound, so an articulatory process that is normally hidden inside the mouth becomes observable and repeatable.

2. Multimedia content presents the spoken sound together with its waveform, its spelling and a video of its use in context, so the same item is coded verbally and visually at the same time and is remembered as one unit.

3. A virtual language lab lets the learner move constituents of a sentence and see at once how the meaning or the parse changes, so the rule is learnt by manipulation and immediate feedback instead of by memorising a definition.

Contrast. The other resource families act on a different layer of the task:

• Email, messaging apps and discussion forums move messages between people, so what reaches the learner through them is another person's explanation put into words; the linguistic process itself is not represented there and cannot be manipulated there, which is what separates this family from the resources the question asks for.

• Word processors and basic typing software compose, edit and format text; their operations are editing and layout operations, and they demonstrate nothing about how the language system works.

• Online dictionaries and spell-check tools answer form-level queries about single words — meaning, spelling, part of speech; a resource set restricted to this word level leaves the process behind the concept unexplained.

The distinction the question turns on is therefore this: a channel that carries someone else's explanation of a process is not the same as a resource that presents the process itself for the learner to observe and act upon, and it is the second kind that most directly builds understanding of a concept whose working is hidden.

Hence the ICT resources that build understanding of complex linguistic concepts are simulations, multimedia content and virtual labs — the representational, experience-rich category that NCERT/CIET guidance on ICT in education recommends for concepts that cannot be shown directly in an ordinary classroom.