While all of the answers you have received are essentially correct, webbing has always been used to describe solder stringing on the bottom side of an assembly as a result of wave solder strands or strings remaining on the unplated portions of the circuit board. This is usually caused by a lack of flux, but can also be caused by a low tin content in an Sn63 wave and other causes. Mike Fenner describes it well.
Splashes are from solder irons dropping  solder onto the CCA, either during a hand soldering operation or touchup/rework. They can also be caused by solder flooding onto the surface from being dragged across the wave too deep. Solder can plow over the front or leading edge, or come up through the various holes in the board to such an extent that they flood over the annular rings.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lawrence Dzaugis
Sent: Tuesday, April 05, 2016 8:51 AM
To: [log in to unmask]
Subject: Re: [TN] TN] QUERIES

Splash on wavesolder from solder splashing up onto pcb. Can be from poorly adjusted backgate on wavesollder, deep pallets pushing through wave. This is easily removed. Can cause bridging later if it rolls around.


Mike Fenner <[log in to unmask]> wrote:
>OK Maybe there is a difference in language here (British versus US 
>English) Irrespective of what IPC says I would say in British English 
>that Solder webbing is as already defined:
>traces of solder left adhering to between pads area usually caused by 
>inadequate fluxing during wave soldering. If quite bad this can be 
>quite large areas. Less severe it used to be described as snails 
>trails. Lesser still could be just individual balls.
>These are not the same as splatter which is solder balls ejected from 
>say through holes by escaping volatiles, or the same from some solder 
>pastes in surface mount or excess solder.
>
>So yes webbing could look the same as spatter. In either case you have 
>solder [possibly mobile] on the surface of the board which is not 
>desirable, but the cause and therefore cure would be different. 
>Alternatively in the case of small balls you could post solder clean the boards to remove them.
>
>--
>Regards
> 
>Mike
>
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Ong Seet Leng
>Sent: Tuesday, April 05, 2016 6:27 AM
>To: [log in to unmask]
>Subject: [TN] QUERIES
>
>Afternoon Tech netters,
>
>Apologize for asking the same question again. I may not have put it 
>correctly in my email send yesterday. Here it is: how do one tell the 
>difference between a solder splatter and solder webbing especially to 
>someone who has no knowledge of soldering anomalies. At a first glance, 
>it may look the same and cannot differentiate between them.
>
>Please advise.
>
>Regards,
>Seet Leng
>
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