It's a feature some phones have where you can program a number into your phone and then when you want to call it, you only have to push usually two buttons.
Speed dialing is a system that allows you to dial an abbreviated code (usually one or two digits) instead of dialing the entire telephone number. You must program your speed dial numbers before using them.
The speed dialing option is not only good for its convenience on dialing numbers fast but if used the right way while driving; while at a light or a pause in traffic flow speed dialing can be utilized very effectively while driving.
DID means Direct Inward Dialing Feature in the PBX features in telecom.
Pretty much any phone (even feature phones) can be configured to use pulse dialing. Some phone companies (e.g. VoIP providers) do not recognize pulse dialing, though.
To route calls to appropriate internal stations without the assistance of an operator
That feature is generally not available on cell phones, although there may be an app for that.
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The function of Direct Inward Dialing is to map a block of numbers on the public telephone network to a block of extensions on your PBX, so that an outside caller can dial directly to a specific extension without going through a switchboard or automated attendant.
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Eagles have a lot of interesting features but the most interesting feature is the trajectory of wing speed.