
innerhalb
within
Indicates a period of time in which something happens or must happen. Takes the genitive.
Die Rechnung muss innerhalb von 14 Tagen bezahlt werden.
The invoice must be paid within 14 days.
within / inside
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within
Indicates a period of time in which something happens or must happen. Takes the genitive.
Die Rechnung muss innerhalb von 14 Tagen bezahlt werden.
The invoice must be paid within 14 days.

inside / within
Describes a position or place that is located within the boundaries of something. Takes the genitive.
Das Rauchen ist nur innerhalb der gekennzeichneten Zonen erlaubt.
Smoking is only allowed within the marked zones.

from inside
Used as an adverb to refer to the inside of something, in contrast to the outside.
Die Tür lässt sich nur von innerhalb öffnen.
The door can only be opened from inside.
The word is composed of `innen` (inside) and `halb` (half/side). It literally describes the inner area of something, which clearly explains the meaning 'inside of'.
Innerhalb der alten Stadtmauern gibt es viele kleine Geschäfte.
Within the old city walls, there are many small shops.
`innerhalb` (within/inside) is a preposition that requires the genitive. The noun that comes after `innerhalb` must therefore be in the genitive.
Bitte erledigen Sie die Aufgabe innerhalb der nächsten Woche.
Please complete the task within the next week.
In spoken language, the genitive after `innerhalb` (within/inside) is often replaced by the construction `von` + dative. This form is very common, but in written language it is considered less formal.
Du musst das innerhalb von einer Woche schaffen.
You have to manage that within one week.
When `innerhalb` (from inside) is used as an adverb, it appears without a noun in the genitive. It then refers to a place and means 'on the inside'.
Die Wände sind von innerhalb gut isoliert.
The walls are well insulated from the inside.
in
in zwei Tagen usually names a point in time two days from now. innerhalb der nächsten zwei Tage, by contrast, sets a deadline: Something can happen earlier, but must happen by the end of that period at the latest.

Der Techniker kommt innerhalb der nächsten zwei Tage.
The technician will come within the next two days.
Der Techniker kommt in zwei Tagen um neun Uhr.
The technician will come in two days at nine o’clock.