what word begins and ends with the letter E, but only contains one letter in it?

I hold your thoughts but cannot think. Used to recall what minds may blink. I travel light, on desks I stay, but never speak a word you say. With lines I’m dressed, in me they dwell your secrets kept, I serve you well.

I'm technically a parent, emphasis on the tech. Buried within your device, I help its components connect.

Smock of freshest summer green, Hair of soft spun gold. Yellow treasure just beneath, Nuggets hundred-fold.

I claim what's yours and call it so, Yet deep below the ground I go. At times I wait with hidden dread, Step too close, I explode instead.