die Zärtlichkeit
tenderness
A feeling or expression of gentle, loving affection.
Er sprach mit großer Zärtlichkeit über seine Kinder.
He spoke with great tenderness about his children.

tenderness
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tenderness
A feeling or expression of gentle, loving affection.
Er sprach mit großer Zärtlichkeit über seine Kinder.
He spoke with great tenderness about his children.

The noun 'die Zärtlichkeit' (tenderness) is derived from the adjective 'zärtlich' (tender/affectionate). The ending '-keit' is often used to form nouns from adjectives that describe a quality or feeling.
Seine Zärtlichkeit zeigte sich in jeder seiner Gesten.
His tenderness showed in every one of his gestures.
In the singular, 'Zärtlichkeit' (tenderness) usually describes the general, abstract feeling of affection. In the plural, 'Zärtlichkeiten' (affectionate gestures), it refers to concrete loving actions such as stroking, hugs, or kisses.
Zwischen den beiden herrschte eine große Zärtlichkeit.
There was great tenderness between the two of them.
A very common expression in the plural is 'Zärtlichkeiten austauschen' (to exchange affectionate gestures). It describes two people showing each other loving gestures.
Sie saßen auf der Parkbank und tauschten Zärtlichkeiten aus.
They sat on the park bench and exchanged affectionate gestures.
love
'die Liebe' and 'die Zärtlichkeit' both have to do with loving closeness. 'Liebe' means the deep feeling toward a person. 'Zärtlichkeit' is more about the gentle way of showing this feeling, for example through a hug, a touch, or loving words. So love can be present inside, even if you do not show it. Tenderness is often visible or noticeable. If you are talking about the strong feeling, 'Liebe' fits. If you are talking about gentle gestures or loving behavior, 'Zärtlichkeit' is more precise.

Nach dem langen Streit fehlte ihm vor allem die Zärtlichkeit im Alltag.
After the long argument, what he missed most in everyday life was the tenderness.
In ihrem Brief schrieb Maria offen über ihre Liebe zu ihrer Familie.
In her letter, Maria wrote openly about her love for her family.